MTB Hydraulic disc brake: 2100mm right rear brake line, 2 piston, 50mm column B, 74mm column A, weight of the brake is appr 346g. Premium quality: Made of high‑quality and firm aluminum alloy, anti corrosive and rustproof,providing comfortable hand smooth.It is durable enough for long time use. Easy and Compatible : Easy to install and remove, even though you use it for the first time. Light in weight and portable.The disc brakes set suitable for most mountain bikes, travel bike,downhill bike,electric ebike,fat bike,folding bike,XC trail,BMX,etc. Ourstanding Performance: Works with disc brake, even when you are biking downhill in a high speed, on a muddy road, or under rainy, snowy weather, the brake set will still guarantee efficient braking.Stopping your bike immediately with the squeeze of one finger Service： If you have any futher questions, you can reach out to us and we will help you within 24 hours.