Premium Material The outer layer is made of PVC and steel wire, which is strong and durable and can be used for a long time. The inner layer of the brake ring is made of high carbon steel, which ensures braking power while making braking stronger due to the extremely low compression ratio. Soft and low compression for guaranteed shifting force. High Safety Performance It uses variable speed steel wire, which has high hardness and ultra-high toughness, and perfectly protects the inner tube. SHOP WITH CONFIDENCE: To provide you with the highest quality service, please feel free to contact us if you have any questions. We provide after-sales service until you are satisfied., Weight: 0.6172943336 pounds, Manufacturer: DONGKER