Ethical Pet Slotted Balls Cat Toys (4-Pack) – Four classic plastic ball toys designed with slots/openings around the sides and a jingle bell inside. When batted, each lightweight ball rolls erratically and the bell tinkles, stimulating cats to give chase. The open-slot design not only lets the bell’s sound out clearly, but also allows cats to snag the ball with their claws for further batting. It’s a simple, time-tested toy set that provides exercise and auditory enrichment for any playful cat.