1. High-speed bearing, 12C nylon, strong non-slip, more effortless riding
2. Universal threaded port, the fit is firmer, and it is not easy to loosen during riding
3. 8 anti-skid studs on one side, double-sided anti-skid tread
4. There are left and right marks under the thread for easy installation
5. Material: chrome molybdenum steel bearing, nylon fiber
6. Size: about 10.6x9.7x1.65cm
7. Weight: about 397 grams