[Hard material] Brake pads are made of moisture-absorbing fibers and nitrile rubber, which are much stronger and more durable than regular rubber. Braking is a matter of safety, please do not use inferior brake pads. [Humanized design] These brake pads have three lines. The first row reminds to replace the brake pads, the second row is that the braking effect will be weakened, and the third row is to replace the brake pads. Be responsible for your own life, please be careful. [Arched drainage design] Arched and drainage design can prevent sand, mud and stone from damaging the rim. The high quality composite rubber has smoother, more stable and faster braking performance, and it also has excellent braking effect in rain and snow. [Wide compatibility] These brake pads fit 20 inch and larger bicycle rims. Now you dont have to go to a bike store anymore, you can buy the same quality as a branded store at a lower price. Product size: 7cmx4cmx1.5cm Shipping Quantity: 2 pairs, 4 in total