Zoom Db680 Mountain Disc Brake Mechanical Caliper Disc Brakes Cycling Double Brake Bicycle Brake Pa finally a mechanical disc brake that offers superior performance and is a nod to put in place. The 680 zoom is a double-sided mechanical where both blocks operate offering yet and precise clamping force. this translates into even pad wear and, with the addition of a simple barrel adjuster, the mat can be adjusted and hassle free. no at completely adjusting the entire stirrup, only to have it continue to slide the fixed side, adding wear double operating face.even wearing padeasy adjustment and set upWorks with ALL cable operated road levers. we strongly recommend compressionless housing.composed works well in dry conditions, can wear quickly in wet / conditions: ZOOMApplicable: V-shake on the market, C brake clamp, wire disc brake, cost-effectiveColour:redMaterial:MetalPackage Contents:1 x Front Disc Brake1 x rear Disc BrakeOnly the above package content, other products are not included.Note: Light reflection 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.