15 Holes Brake Disc Design: Adopt 5 holes brake disc, diameter is up to 120mm / 7in, high temperature quenching passivation, rust prevention and other multi channel process, not easy to deform, not rust, not afraid of wet, muddy or dusty environment. 2Protect Effectively: Brake disc style is novel, can well protect your car, DIY electric bike modification accessories can reduce the accumulation of brake dust on the wheels, air circulation around the brake also helps to heat dissipation. 3Manufacturing Material: Brake pads are made of stainless steel brake discs and synthetic metal brake pads, providing good heat resistance, good heat dissipation performance, high static friction coefficient, very long service life, high temperature resistance, low noise, mute and do not hurt the disc brake. 4Providing Maximum Safety: Easy to install, brake pads are consumable and will wear out after long use, providing maximum safety for you and your electric scooter, it is recommended to replace the brake pads when damaged. 5Simple Operation: 5 screws, very easy to install and disassemble, simple and easy to operate and install, the screws perfectly match the wheel for Xiaomi electric scooter, effectively protect the wheel, prolong the life. 6Applicability: Suitable for Xiaomi M365 PRO, PRO2 models and other 5 hole screws hole spacing of 2540mm models.