Knobby Balls - 8 Inch Size Knobby Bounce Ball Party- Balls Massage Balls 1 Pack of 4pcs This is for a 4 pack of colorful Knobby Balls Great for Babies to the Big Kids. Each ball is 8" in diameter Great for learning how to play catch, also great for the pool or tub.. These are lightweight & have a cool, bumpy texture Note: balls come not inflated and colors may vary