These mini tennis balls are 1.5" in diameter and this product includes a pack of 12 of these tennis balls. These are for small breed dogs and puppies because they are mini and cold possibly becoming a choking hazard for larger dogs. Small dogs with small mouths need small balls and these fit the bill! These are made especially for little dogs; you'll now be able to play fetch all day long! These balls do not contain squeakers, but they do fit in many ball launchers.