Mute and powerful ultra smooth and stable to rotate protect your pet to the most extent. Anti-slip screw thread can protect pets from tumble due to inertia when they are playing. Silent design with bracket. Provide your small pet a safe environment to exercise and play. Accorded with aerodynamics can reduce the wind resistance make smooth rotation and cause less shake. For convenient to transport we disassemble the disc from the bearing you can assemble easily. Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors the picture may not reflect the actual color of the item. Thank you!