Sturdy and durable: the rear brake calliper is made of aluminium alloy structure and is not easy to damage. Safe driving: brake pads can improve the effect of the scooter, making you when driving. Products include: the rear calliper contains 2 pieces of resin material brake pads, which can produce better friction. Installation position: installed on the left side of the wheel, the installation distance between the two screw holes is 50 mm. Strong compatibility: designed for 1S M365 Pro electric scooter, compatible with accessories. Colour:blue Material:aluminum alloy Size:9 x 8 x 7 cm Package Contents: 1 x disc brake disc 2 x Nuts 2 x screws Only 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.