 It shoots .43-caliber paintballs, which are loaded into alloy or biodegradable plastic shells, which eject after every shot.The paintballs used for this marker are smaller than the standard .68-caliber that most markers use.The T68 M249 Magazine is designed after the real M249 magazine for the Squad Automatic Weapon; this magazine holds 200 .68-caliber paintballs, like most hoppers.