Meterial: made of EVA Foam; lightweight balls--Cat Quiet Play Toys; the cat and puppies can carry the foam balls around the house..Color: Red rainbow is bright so that they can catch the cats' eye easily and attracts your pet's interest..Size: 3.5CM Dia. about 1.38 inches. The cats can pick it up in their mouth and carry it to wherever he/she wants to play. Great for fetching, training, chewing and teething..Bounce: they are not bouncy. But cats and puppies loves them very much..Great for interactive or independent play, easy to roll it and chase.Perfect for birthday gift, pet shop, pet owner.