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
