Material Plastic Color Blue Target Species Guinea Pig, Gerbil, Hamster, Chinchilla Two-way rotation: Screw into the bracket and then into the Flying Saucer, forming a rotary support, the rotation is very smooth, the hamster can run and play on it as much as he likes. Wavy pattern design: This silent hamster wheel has wavy pattern, which is slip free and safe for the hamster. Smooth edges that won't hurt the pet's feet. Bearing is of good mute effect and durable in service life. Keep Healthy: Encourage hamsters to exercise normally. The exercise wheel can greatly arouse your pets interest to do exercise and keep them health. Safe material: Made of delicate plastic, odorless and durable, it is the best gift for your pet. Easy to Clean: The whole-body washable, keep it clean, increase pets exercise frequency to keep healthy.