While your dog plays, the soft spines on the outside promote gum and teeth health Squeaker and ball are all part of one piece, eliminating choking hazards Soft, safe and durable; suitable to play with in the yard, home or park. High visibility colors ideal for playing with your dog day or night!Fun interactive toy for you and your companion Assorted Colors Small 2.5" Diameter Medium 3.5" Diamter Large 4.5" Diameter