[High-quality metal materials]: The bearings are made of high-quality metal materials, which have good noiseless effect, long service life, strong, lightweight, non-toxic, heat-resistant. wear and bite [Stable and Safe]: The aerodynamic design reduces wind resistance and makes the wheels run smoother. Smooth edges will not hurt your pets feet. Convenient and safe [Silent Running Wheel]: Super quiet, hamsters play at night, do not affect the owners sleep, encourage healthy exercise. At the same time with nail polish, polish excess nails while playing [Easy to clean]: Detachable bracket and wheel design make it easy to disassemble and clean. Increase the frequency of pet exercises to maintain health. Non-slip design, not easy to get stuck [Easy to install]: It can be installed on a metal cage or an acrylic cage, easy to install, and the speed is stable. The round edge sleeve will make it stronger, stable and durable Feature: All metal, durable and anti-bite, strong fulcrum support, axis not easy to shorten The all-metal design prevents animals from biting. Used with nail polish, small pet nails while playing Silent bearing design allows your pets to play confidently without affecting the owners rest and life The stand design, one thing for two purposes, can be used directly in the cage, or can be hung on the cage for use Specification: Product Name: Metal Silent Running Wheel Diameter of the rolling wheel: 23cm Race wheel width: 9cm Total width of racing wheel: 12cm Distance between the racing wheel and the support: 3cm