Since it is made of premium plastic material, it is ultralight and adds no extra weight to your bike. Featuring simple installation and disassembly, it is more convenient to use.The function of this pedal assist sensor is to help extend cycling mileage with good accuracy. What brings higher sensitivity and precision is the multi magnets design.Made of high quality plastic and metal material, it is durable.The line length is 90cm, the magnetic disk diameter is 6.5cm. It can prolong battery life to prevent being damaged by electricity.This product is perfectly suitable for bike, electric bicycle, etc. According to the speed of the turn of the foot to identify the power, pedal up in the process of riding is more lightweight and electricity saving.Item Name: E-Bike Pulse Assist SensorMaterial: Plastic, MetalMagnet: 5/8/12PcsFeatures: Rust-proof, High Sensitivity, High AccuracySize Details: Line Length: 90cm/35.43" (Approx.)Magnetic Disk Diameter: 6.5cm/2.56" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Line 1 x Magnetic Disk