Package Includes: The package contains 14 pieces including 1 hamster paddle wheel and 13 accessories, the accessories include 2 round washers, 3 screws, 3 nuts, 1 shofar nut, 2 triangle pieces and 1 screwdriver, 1 bearing piece. High Quality Material: This hamster racing wheel is made of high quality eco-friendly boards and wood-plastic panels. It provides reliable position and support when running or walking, allowing your hamsters to run endlessly, maintain happiness and sanity. Quiet Design: The hamster wheel bearing is equipped a silent, extremely quiet skate that does not wobble and is efficient and smooth. Even if your pet walks around at night, no one will be disturbed. Solid And Non-Slip: The hamster wheel is not easy to fall off after installation and is safer to use. It can easily be inserted into the pet's cage. Non-slip design prevents your pet from slipping and getting hurt while walking and playing. Wide Range of Uses: This pet exercise bike is designed for chinchillas, gerbils, hedgehogs , mice and other similar small animals, and helps entertain and exercise all animals to keep them happy and healthy.