The single size is 31mm x 35mm, which is compact, lightweight and durable. Ultimate Braking Power QuietMore copper particles, better heat dissipationMore perfect surface spray treatment batter than other common disc brake padsBicycle Parts Slim size, very easy to use without any difficulty. At least 2 times that of other common disc brake pads.Hydraulic disc brakes are suitable for a wide range of applications, refer to applicable brake models: (including but not limited to), for Simano M31 5.355.375.395.416.446.447.475.515.525.575..., There are also mid-range models of other brands of vehiclesNote: Before buying, please verify if the style is applicablecolour: blackMaterial: Semi-MetalPackage Contents:10 pairs x brake padsOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.