(1) BB5Matte 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 gramsApplicable models: XC / FR / AM / DSThe 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) BB7BB7 + 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 gramsSuitable models: XC / FR / AM / DSThe 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-free.