Kong Active cat toys promote healthy movement and satisfy your cat's hunting and prey instincts. Cats also want to have fun. Kong Cat Tennis Balls are made with non-abrasive felt material, which protects their teeth while playing. The bell inside is irresistible to cats and encourages plenty of movement for your indoor feline. The balls satisfy the hunting instinct in cats. They come in various designs and materials, from bouncy to those filled with beads and bells. During playtime, your cat trains its ancient instincts and refines its physical abilities, whether alone or together with you.