Description: This speed 12 magnets specially designed for electric s, which can adjust the riding intensity at any time according to the wind direction, slope and speed The induction adopts the integrated structure design of the built-in disk, which realizes the concentric movement of the disk and the induction High sensing sensitivity, stable signal, convenient and fast installation, beautiful appearance Makes riding easier, extend battery life, improve the cruising range of the whole vehicle, and avoid the damage to the battery caused by high current discharge. Lightweight and power saving. Fits almost all electric bikes Specification: Color: Black Material: ABS Size: Approx. outer ring diameter 6.5cm/2.56inch inner ring diameter 1.5cm/0.59inch wire length about 1m/39.37inch Package Includes: 1 Set Electric Bike Power Pedal Assist Sensor(6 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful line shopping!