1. Carbon steel spring: 3 spring (carbon steel), outer diameter 15mm 2. Hand screw: no tools simple disassembly and assembly-free combination, no longer need to worry about complex steps will not operate. 3. Mesh ventilation: double-sided composite OK Cloth, breathable. 4. Universal bandage: The top of the bandage is made of nylon clasp, which is easy to wear. 5. Anti-skid fabrics: more firmly and precisely. Applicable scope: climbing, climbing, sports fitness, work handling, etc. 6. Stabilize the basal bones of both upper and lower sides to relieve the pressure on the knee. 7. Upgrading knee performance to cushion knee impact in running and jumping. 8. Enhance the activity energy to alleviate knee fatigue wear. 8. Strengthen your legs and knees by 40 kg when squatting up.