Innovative disc that bounces and floats like a tennis ball, but also rolls on the ground with the greatest of ease so your dog can chase it and fetch it back. Rubber wheel for dogs bounces & floats for unlimited, creative exercise for your dog & you. Roll wheel to unleash your dog's chasing and herding action. Open interior makes pick-up easy for dogs of all sizes. Durable rubber outside is easy on your pet's mouth. Inside is bright, tough canvas-style nylon with double-sewn seams. Foam core ensures added buoyancy. Satisfies a dog's instincts to chase and herd.