Sturdy & safe : Solid non slip running surface is safe for pet's feet and easy to clean and resistant to odors. Anti-slip screw thread: With radial stripes design, increase friction and avoid your hamster slip and fall, also works great to provide run-up. Jogging running silent spinner : Unlike other squeaky and noisy exercise wheels, our hamster spinning wheel is ultra-silent. You’ll not be disturbed by any noise! Item Specifications: Item Weight 110g/, 3.88ounce, 18*12*16 cm/7.08*4.72*6.3 inch. Hamster toys: Our hamster flying saucer wheel with ultra-quiet design, and smooth intimated edge of running wheels, Suitable for small animals, such as hamster, chinchilla, gerbil, rat, chipmunk, squirrel, guinea pig and so on.