Quality:4 pairsMaterial:Semi-Metallic resin100 % Brand new and high quality Compact，lightweight and durableUltimate brake power Silent More red copper granules，Better heat dissipationperfect surface spray treatment batter than other normal disc brake padsParts for bicycle Slim size，very convenient to use without any difficulties.Thickness: 4 mmAt least 2 times than other normal disc brake pads.Tested By TUV Rheinland with EU Standards，EN14766:200