Make of alloys, these brake pad is enduring and wear resistant. Slightly curved design doesn't hurt wheel and provide better , less noise. Unique sand guide grooves effectively sand/stone damages to wheel rims. This bike brake pad is suitable for most types of bikes, such as a road bike, mountain bike that use brake. Package includes: 4PCS Brake Pad 2PCS Brake Bend Pipe 2PCS Rubber Sleeve