The Grinz Ball is soft enough not to hurt your dogs teeth, but firm enough to bounce. The funniest, playful treat ball under the sun. It will have Fido grinning from ear to ear. Made with SEBS (Styrene Ethylene Butylene Styrene) which floats nicely on the water for easy fetching. Push treats into the hole and watch your dog have hours of fun! Bite-O-Meter: 3. Color: Lime. Size: 2.5in.