(1) BB5 Matte black paint, CNC cutting, metal to make the film, super force. Single-sided adjustment technology, without tools, can adjust the position of the inner and outer brake pads or replace the brake pads anytime, anywhere. 3D full-angle caliper mounting base to ensure the correct position of the brake pads. The pull force fine adjustment mechanism can adjust the rebound pull force to ensure the feel. Impervious discs, impurities such as water / sand can be expelled quickly, no harsh braking sounds can be heard, heat can be quickly dissipated, and the braking force is still outstanding under various harsh conditions. Weight: about 421 grams Applicable models: XC / FR / AM / DS The complete set includes: front / rear clamps, front / rear 6 4 large screws. * Optional: 160mm domestic G3 disc with 12 small screws. Avid BB5 mechanical disc brake has a large market share and has a good reputation among users. It is the same as the Hayes MX / GX series, but its appearance is more pleasing and its performance is second only to the same door mechanical disc brake BB7. (2) BB7 BB7 + premium discs have much better braking performance than many oil discs! Commonly used in high-end cars *Optional: 160mm domestic G3 disc with 12 small screws. Weight: about 439 grams Suitable models: XC / FR / AM / DS The complete set includes: front / rear clamps, 4 large screws. Pearl dark silver grey lacquer, CNC cut, enlarged metal to make the piece, super force. CPS double-sided adjustment technology, without tools, can adjust the position of the inner and outer brake pads, or replace the brake pads anytime, anywhere. 3D full-angle caliper mounting base to ensure the correct position of the brake pads. The pull force fine adjustment mechanism can adjust the rebound pull force to ensure the feel. Impervious discs, impurities such as water / sand can be expelled quickly, no harsh braking sounds can be heard, heat can be quickly dissipated, and the braking force is still outstanding under various harsh conditions. Fully sealed clamp, waterproof and dustproof, completely maintenance- .