Make Fetch Happen with the Chuckit! UltraRing . The UltraRing is the ultimate chase and fetch toy 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 insticts. Bright colors make it easy to find in snow or bright sun making it the ultimate chase and fetch toy. Compatible with the Chuckit! RingChaser for even more fetch fun. Product note: For supervised play only. Diameter: 4.9"