The UltraRing is the ultimate chase and because of the unique topspin infused action that causes the UltraRing to erratically bounce, zig-zag, and hop on the ground just like real game, engaging your dog's natural chase instincts. Compatible with the Chuckit! RingChaser. The UltraRing is designed to provide an unpredictable chase experience, stimulating your pup's natural hunting instincts. With topspin-infused motion, it hops, zig-zags, and bounces just like a real game. Plus, it seamlessly pairs with the Chuckit! RingChaser for interactive play.