diff --git a/src/kametan0730mc/RunForMoney2/Main.php b/src/kametan0730mc/RunForMoney2/Main.php
index 3f5bd17..5c266c1 100755
--- a/src/kametan0730mc/RunForMoney2/Main.php
+++ b/src/kametan0730mc/RunForMoney2/Main.php
@@ -210,7 +210,7 @@ private function initEnchantment(){
 		EnchantmentIdMap::getInstance()->register(EnchantmentIds::SHARPNESS, VanillaEnchantments::THORNS());
 	}
 
-	protected function onEnable(){
+	protected function onEnable() : void{
 		date_default_timezone_set("Japan");
 
 		$this->getServer()->getWorldManager()->setAutoSave(false);
diff --git a/src/kametan0730mc/RunForMoney2/entity/Agent.php b/src/kametan0730mc/RunForMoney2/entity/Agent.php
index 990e0f2..49d30c6 100755
--- a/src/kametan0730mc/RunForMoney2/entity/Agent.php
+++ b/src/kametan0730mc/RunForMoney2/entity/Agent.php
@@ -6,14 +6,12 @@
 
 
 use pocketmine\entity\Entity;
+use pocketmine\entity\EntitySizeInfo;
 use pocketmine\network\mcpe\protocol\types\entity\EntityIds;
 
 class Agent extends Entity{
-	/* @var float */
-	public $width = 0.1;
 
-	/* @var float */
-	public $height = 0.1;
+	protected function getInitialSizeInfo() : EntitySizeInfo{ return new EntitySizeInfo(0.1, 0.1); }
 
 	public static function getNetworkTypeId() : string{ return EntityIds::AGENT; }
 }
\ No newline at end of file
diff --git a/src/kametan0730mc/RunForMoney2/entity/LightningBolt.php b/src/kametan0730mc/RunForMoney2/entity/LightningBolt.php
index af82815..b6c7c86 100755
--- a/src/kametan0730mc/RunForMoney2/entity/LightningBolt.php
+++ b/src/kametan0730mc/RunForMoney2/entity/LightningBolt.php
@@ -6,19 +6,18 @@
 
 
 use pocketmine\entity\Entity;
+use pocketmine\entity\EntitySizeInfo;
 use pocketmine\entity\Living;
 use pocketmine\network\mcpe\protocol\types\entity\EntityIds;
 
 class LightningBolt extends Entity{
-	/* @var float */
-	public $width = 0.1;
-
-	/* @var float */
-	public $height = 0.1;
-
 	/** @var int */
 	public $age = 0;
 
+	protected function getInitialSizeInfo() : EntitySizeInfo{
+		return new EntitySizeInfo(0.1, 0.1);
+	}
+
 	public static function getNetworkTypeId(): string{
 		return EntityIds::LIGHTNING_BOLT;
 	}
diff --git a/src/kametan0730mc/RunForMoney2/entity/projectile/DragonFireball.php b/src/kametan0730mc/RunForMoney2/entity/projectile/DragonFireball.php
index 3240632..27abeca 100755
--- a/src/kametan0730mc/RunForMoney2/entity/projectile/DragonFireball.php
+++ b/src/kametan0730mc/RunForMoney2/entity/projectile/DragonFireball.php
@@ -5,14 +5,13 @@
 namespace kametan0730mc\RunForMoney2\entity\projectile;
 
 
+use pocketmine\entity\EntitySizeInfo;
 use pocketmine\entity\projectile\Projectile;
 use pocketmine\network\mcpe\protocol\types\entity\EntityIds;
 
 class DragonFireball extends Projectile{
-	/* @var float */
-	public $width = 0.1;
 
-	/* @var float */
-	public $height = 0.1;
+	protected function getInitialSizeInfo() : EntitySizeInfo{ return new EntitySizeInfo(0.1, 0.1); }
+
 	public static function getNetworkTypeId() : string{ return EntityIds::DRAGON_FIREBALL; }
 }
\ No newline at end of file
diff --git a/src/kametan0730mc/RunForMoney2/entity/projectile/FishingHook.php b/src/kametan0730mc/RunForMoney2/entity/projectile/FishingHook.php
index 9776527..df7c50d 100755
--- a/src/kametan0730mc/RunForMoney2/entity/projectile/FishingHook.php
+++ b/src/kametan0730mc/RunForMoney2/entity/projectile/FishingHook.php
@@ -5,14 +5,13 @@
 namespace kametan0730mc\RunForMoney2\entity\projectile;
 
 
+use pocketmine\entity\EntitySizeInfo;
 use pocketmine\entity\projectile\Projectile;
 use pocketmine\network\mcpe\protocol\types\entity\EntityIds;
 
 class FishingHook extends Projectile{
-	/* @var float */
-	public $width = 0.1;
 
-	/* @var float */
-	public $height = 0.1;
+	protected function getInitialSizeInfo() : EntitySizeInfo{ return new EntitySizeInfo(0.1, 0.1); }
+
 	public static function getNetworkTypeId() : string{ return EntityIds::DRAGON_FIREBALL; }
 }
\ No newline at end of file