diff --git a/src/overlays/actors/ovl_Boss_Mo/z_boss_mo.c b/src/overlays/actors/ovl_Boss_Mo/z_boss_mo.c
index f80a01a11e..1849c7e41e 100644
--- a/src/overlays/actors/ovl_Boss_Mo/z_boss_mo.c
+++ b/src/overlays/actors/ovl_Boss_Mo/z_boss_mo.c
@@ -381,7 +381,7 @@ void BossMo_Init(Actor* thisx, PlayState* play2) {
     } else {
         Actor_SetScale(&this->actor, 0.01f);
         BossMo_SetupTentacle(this, play);
-        this->actor.colChkInfo.mass = 0xFF;
+        this->actor.colChkInfo.mass = MASS_IMMOVABLE;
         MO_WATER_LEVEL(play) = -50;
         this->waterTexAlpha = 90.0f;
         this->actor.world.pos.y = MO_WATER_LEVEL(play);
diff --git a/src/overlays/actors/ovl_Boss_Tw/z_boss_tw.c b/src/overlays/actors/ovl_Boss_Tw/z_boss_tw.c
index 67b820b93a..72b07e4e01 100644
--- a/src/overlays/actors/ovl_Boss_Tw/z_boss_tw.c
+++ b/src/overlays/actors/ovl_Boss_Tw/z_boss_tw.c
@@ -484,7 +484,7 @@ void BossTw_Init(Actor* thisx, PlayState* play2) {
     }
 
     Actor_SetScale(&this->actor, 2.5 * 0.01f);
-    this->actor.colChkInfo.mass = 255;
+    this->actor.colChkInfo.mass = MASS_IMMOVABLE;
     this->actor.colChkInfo.health = 0;
     Collider_InitCylinder(play, &this->collider);
 
diff --git a/src/overlays/actors/ovl_En_Dekunuts/z_en_dekunuts.c b/src/overlays/actors/ovl_En_Dekunuts/z_en_dekunuts.c
index 3577d1394b..c21d760eb9 100644
--- a/src/overlays/actors/ovl_En_Dekunuts/z_en_dekunuts.c
+++ b/src/overlays/actors/ovl_En_Dekunuts/z_en_dekunuts.c
@@ -178,7 +178,7 @@ void EnDekunuts_SetupBurrow(EnDekunuts* this) {
 void EnDekunuts_SetupBeginRun(EnDekunuts* this) {
     Animation_MorphToPlayOnce(&this->skelAnime, &gDekuNutsUnburrowAnim, -3.0f);
     this->collider.dim.height = 37;
-    this->actor.colChkInfo.mass = 0x32;
+    this->actor.colChkInfo.mass = 50;
     Actor_PlaySfx(&this->actor, NA_SE_EN_NUTS_DAMAGE);
     this->collider.base.acFlags &= ~AC_ON;
     this->actionFunc = EnDekunuts_BeginRun;
@@ -446,7 +446,7 @@ void EnDekunuts_ColliderCheck(EnDekunuts* this, PlayState* play) {
     if (this->collider.base.acFlags & AC_HIT) {
         this->collider.base.acFlags &= ~AC_HIT;
         Actor_SetDropFlag(&this->actor, &this->collider.elem, true);
-        if (this->actor.colChkInfo.mass == 0x32) {
+        if (this->actor.colChkInfo.mass == 50) {
             if ((this->actor.colChkInfo.damageEffect != 0) || (this->actor.colChkInfo.damage != 0)) {
                 if (this->actor.colChkInfo.damageEffect != 1) {
                     if (this->actor.colChkInfo.damageEffect == 2) {
diff --git a/src/overlays/actors/ovl_En_Dnt_Jiji/z_en_dnt_jiji.c b/src/overlays/actors/ovl_En_Dnt_Jiji/z_en_dnt_jiji.c
index 5bd9228946..fb0b7bc340 100644
--- a/src/overlays/actors/ovl_En_Dnt_Jiji/z_en_dnt_jiji.c
+++ b/src/overlays/actors/ovl_En_Dnt_Jiji/z_en_dnt_jiji.c
@@ -83,7 +83,7 @@ void EnDntJiji_Init(Actor* thisx, PlayState* play) {
     // "Deku Scrub mask show elder"
     PRINTF(VT_FGCOL(YELLOW) "☆☆☆☆☆ デグナッツお面品評会長老 ☆☆☆☆☆ %x\n" VT_RST, this->stage);
     this->actor.flags &= ~ACTOR_FLAG_ATTENTION_ENABLED;
-    this->actor.colChkInfo.mass = 0xFF;
+    this->actor.colChkInfo.mass = MASS_IMMOVABLE;
     this->actor.attentionRangeType = ATTENTION_RANGE_6;
     this->actionFunc = EnDntJiji_SetFlower;
     this->actor.gravity = -2.0f;
diff --git a/src/overlays/actors/ovl_En_Dnt_Nomal/z_en_dnt_nomal.c b/src/overlays/actors/ovl_En_Dnt_Nomal/z_en_dnt_nomal.c
index f6eaf076b5..2863aa1f80 100644
--- a/src/overlays/actors/ovl_En_Dnt_Nomal/z_en_dnt_nomal.c
+++ b/src/overlays/actors/ovl_En_Dnt_Nomal/z_en_dnt_nomal.c
@@ -128,7 +128,7 @@ void EnDntNomal_Init(Actor* thisx, PlayState* play) {
         this->type = ENDNTNOMAL_TARGET;
     }
     this->actor.flags &= ~ACTOR_FLAG_ATTENTION_ENABLED;
-    this->actor.colChkInfo.mass = 0xFF;
+    this->actor.colChkInfo.mass = MASS_IMMOVABLE;
     this->objectId = -1;
     if (this->type == ENDNTNOMAL_TARGET) {
         PRINTF("\n\n");
@@ -676,7 +676,7 @@ void EnDntNomal_SetupStageAttack(EnDntNomal* this, PlayState* play) {
     if (this->timer3 == 0) {
         this->endFrame = (f32)Animation_GetLastFrame(&gDntStageSpitAnim);
         Animation_Change(&this->skelAnime, &gDntStageSpitAnim, 1.0f, 0.0f, this->endFrame, ANIMMODE_ONCE, -10.0f);
-        this->actor.colChkInfo.mass = 0xFF;
+        this->actor.colChkInfo.mass = MASS_IMMOVABLE;
         this->isSolid = true;
         this->timer2 = 0;
         Actor_ChangeCategory(play, &play->actorCtx, &this->actor, ACTORCAT_ENEMY);
diff --git a/src/overlays/actors/ovl_En_Dodojr/z_en_dodojr.c b/src/overlays/actors/ovl_En_Dodojr/z_en_dodojr.c
index 7b5d7a7586..0090a17cd3 100644
--- a/src/overlays/actors/ovl_En_Dodojr/z_en_dodojr.c
+++ b/src/overlays/actors/ovl_En_Dodojr/z_en_dodojr.c
@@ -63,7 +63,7 @@ static ColliderCylinderInit sCylinderInit = {
     { 18, 20, 0, { 0, 0, 0 } },
 };
 
-static CollisionCheckInfoInit2 sColChkInit = { 1, 2, 25, 25, 0xFF };
+static CollisionCheckInfoInit2 sColChkInit = { 1, 2, 25, 25, MASS_IMMOVABLE };
 
 void EnDodojr_Init(Actor* thisx, PlayState* play) {
     EnDodojr* this = (EnDodojr*)thisx;
diff --git a/src/overlays/actors/ovl_En_Gb/z_en_gb.c b/src/overlays/actors/ovl_En_Gb/z_en_gb.c
index e7fa809a06..40612e8646 100644
--- a/src/overlays/actors/ovl_En_Gb/z_en_gb.c
+++ b/src/overlays/actors/ovl_En_Gb/z_en_gb.c
@@ -176,7 +176,7 @@ void EnGb_Init(Actor* thisx, PlayState* play) {
 
     ActorShape_Init(&this->dyna.actor.shape, 0.0f, ActorShadow_DrawCircle, 35.0f);
     Actor_SetScale(&this->dyna.actor, 0.01f);
-    this->dyna.actor.colChkInfo.mass = 0xFF;
+    this->dyna.actor.colChkInfo.mass = MASS_IMMOVABLE;
     this->dyna.actor.speed = 0.0f;
     this->dyna.actor.velocity.y = 0.0f;
     this->dyna.actor.gravity = -1.0f;
diff --git a/src/overlays/actors/ovl_En_Horse/z_en_horse.c b/src/overlays/actors/ovl_En_Horse/z_en_horse.c
index d02d1b5fa4..843427fc8b 100644
--- a/src/overlays/actors/ovl_En_Horse/z_en_horse.c
+++ b/src/overlays/actors/ovl_En_Horse/z_en_horse.c
@@ -3608,9 +3608,9 @@ void EnHorse_Update(Actor* thisx, PlayState* play2) {
         }
 
         if (thisx->speed == 0.0f && !(this->stateFlags & ENHORSE_FLAG_19)) {
-            thisx->colChkInfo.mass = 0xFF;
+            thisx->colChkInfo.mass = MASS_IMMOVABLE;
         } else {
-            thisx->colChkInfo.mass = 0xFE;
+            thisx->colChkInfo.mass = MASS_HEAVY;
         }
 
         if (thisx->speed >= 5.0f) {
diff --git a/src/overlays/actors/ovl_En_Mk/z_en_mk.c b/src/overlays/actors/ovl_En_Mk/z_en_mk.c
index ba73bf7732..ab748fe164 100644
--- a/src/overlays/actors/ovl_En_Mk/z_en_mk.c
+++ b/src/overlays/actors/ovl_En_Mk/z_en_mk.c
@@ -60,7 +60,7 @@ void EnMk_Init(Actor* thisx, PlayState* play) {
     Animation_PlayLoop(&this->skelAnime, &object_mk_Anim_000D88);
     Collider_InitCylinder(play, &this->collider);
     Collider_SetCylinder(play, &this->collider, &this->actor, &sCylinderInit);
-    this->actor.colChkInfo.mass = 0xFF;
+    this->actor.colChkInfo.mass = MASS_IMMOVABLE;
     Actor_SetScale(&this->actor, 0.01f);
 
     this->actionFunc = EnMk_Wait;
diff --git a/src/overlays/actors/ovl_En_Ny/z_en_ny.c b/src/overlays/actors/ovl_En_Ny/z_en_ny.c
index 2c04b71db8..e31bd37d52 100644
--- a/src/overlays/actors/ovl_En_Ny/z_en_ny.c
+++ b/src/overlays/actors/ovl_En_Ny/z_en_ny.c
@@ -138,7 +138,7 @@ void EnNy_Init(Actor* thisx, PlayState* play) {
         // "Dummy new initials"
         PRINTF("ダミーニュウ イニシャル[ %d ] ！！\n", this->actor.params);
         PRINTF("En_Ny_actor_move2[ %x ] ！！\n", EnNy_UpdateUnused);
-        this->actor.colChkInfo.mass = 0xFF;
+        this->actor.colChkInfo.mass = MASS_IMMOVABLE;
         this->actor.update = EnNy_UpdateUnused;
         this->collider.base.colMaterial = COL_MATERIAL_METAL;
     }
diff --git a/src/overlays/actors/ovl_En_Skb/z_en_skb.c b/src/overlays/actors/ovl_En_Skb/z_en_skb.c
index 824528d5d9..da5b8bd4bc 100644
--- a/src/overlays/actors/ovl_En_Skb/z_en_skb.c
+++ b/src/overlays/actors/ovl_En_Skb/z_en_skb.c
@@ -160,7 +160,7 @@ void EnSkb_Init(Actor* thisx, PlayState* play) {
     this->actor.colChkInfo.damageTable = &sDamageTable;
     ActorShape_Init(&this->actor.shape, 0.0f, ActorShadow_DrawCircle, 0.0f);
     this->actor.focus.pos = this->actor.world.pos;
-    this->actor.colChkInfo.mass = 0xFE;
+    this->actor.colChkInfo.mass = MASS_HEAVY;
     this->actor.colChkInfo.health = 2;
     this->actor.shape.yOffset = -8000.0f;
     SkelAnime_Init(play, &this->skelAnime, &gStalchildSkel, &gStalchildUncurlingAnim, this->jointTable,
diff --git a/src/overlays/actors/ovl_En_Trap/z_en_trap.c b/src/overlays/actors/ovl_En_Trap/z_en_trap.c
index 8763edd047..420e5a1ca1 100644
--- a/src/overlays/actors/ovl_En_Trap/z_en_trap.c
+++ b/src/overlays/actors/ovl_En_Trap/z_en_trap.c
@@ -113,7 +113,7 @@ void EnTrap_Init(Actor* thisx, PlayState* play) {
     Collider_SetCylinder(play, &this->collider, thisx, &sCylinderInit);
     ActorShape_Init(&thisx->shape, 0.0f, ActorShadow_DrawCircle, 0.0f);
     thisx->attentionRangeType = ATTENTION_RANGE_3;
-    thisx->colChkInfo.mass = 0xFF;
+    thisx->colChkInfo.mass = MASS_IMMOVABLE;
 }
 
 void EnTrap_Destroy(Actor* thisx, PlayState* play) {