Feature: 1. [Stable Brake Lining] Bike disc brake set, both sides drive the brake lining at the same time, keep the center without deviation. Brake disc with automatic return function. Mineral brake oil can maintain stable braking performance under high temperature conditions. 2. [Safety Protection] CNC mountain bike hydraulic brake oil brake kit, sensitive, strong braking force, each slot is equipped with a protective piece. Aluminum alloy decorative cup cover can enhance the texture and hide the cup vent to avoid the influence of water steam and dirt. 3. [Premium Brake Hose] The brake hose is made of high density, low elastic material, ensuring high braking capacity of brake oil pressure, with special low friction surface treatment to prevent scratching of frame paint. Front 890mm, rear 1570mm. 4. [Easy To Use] When the brake discs are worn, just adjust the knob to reduce the distance between the two brake discs, so that the braking feeling is always at its best. However, when the wear reaches a certain level, it is recommended to replace them immediately. 5. [High Performance] Electric bike hydraulic disc brake kit adopts full aluminum alloy CNC caliper body, automatic brake disc return function, and easy brake disc replacement. Non corrosive mineral brake oil, with high temperature braking performance. Specification: Item Type: Bike Disc Brake Set Material: Aluminum Alloy Brake Hose Size: Front: Approx. 890mm/35.0in, Rear: Approx. 1570mm/61.8in. Package List: 1 x Rear Brake1 x Front Brake2 x Discs (with 12 Screws) 2 x Brake Lining Piece 4 x Screws1 x Oil Needle 2 x Accessories Note: 1. Do not remove the black protective clips before installation. Do not squeeze the brake with an empty pinch, otherwise it will cause oil leakage or scrap.2. Manual measurement, please allow some errors.