【HARD-WEARING MATERIAL】 The brake pads are made of hyathetic fiber and nitrile rubber, they have supreme durable and long-lasting than ordinary rubber. brake is a safety issue related to life, please do not use poor quality brake pads.【EXPERIMENTAL DATA】 After many experiments we have obtained data, when the vehicle speed is 12.5km/h, it can be used continuously for more than 8000 times, while the ordinary brake pad is only 3,000 times. It can be replaced by 4,000 miles in smooth kilometers and 1,000 miles in steep hill.【HUMANIZE DESIGN】 This brake pads have three while lines. the first line is remind to replace the brake pads, the second line is braking effect will weaken, the third line is must replace brake pads. in order to be responsible for your life, please pay attention.【ACCORD AERODYNAMICS】 The arc and drainage design can prevent damages from sand, mud and stone to the wheel rims, the braking performance of high quality compound rubber is softer, smoother and quicker, and it will have excellent braking effect even in rainy and snow days.【BROAD COMPATIBILITY】 These brake pads are suitable for bike that above 20inchs and all v-brake systems, such as SRMA/SHIMANO/TEKTRO.