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 convenient to use. The function of this pedal assist sensor is to help extend cycling mileage with good accuracy. The multi-magnet design provides higher sensitivity and precision. Made of high-quality plastic and metal materials, it is durable. The line length is 90cm, and the magnetic disk diameter is 6.5cm. It can help prolong battery life and prevent electrical damage. This product is suitable for bicycles and electric bicycles. It detects the speed of pedaling to determine power assistance, making pedaling during riding easier and more energy-efficient. Item Name: E-Bike Pulse Assist Sensor Material: Plastic, Metal Magnet: 5/8/12 Pcs Features: Rust-proof, High Sensitivity, High Accuracy Size Details: - Line Length: 90cm / 35.43" (Approx.) - Magnetic Disk Diameter: 6.5cm / 2.56" (Approx.) Notes: Due to differences in lighting and screen settings, the item's color may vary slightly from the images. Slight dimensional differences may occur due to manual measurement. Package Includes: 1 x Line 1 x Magnetic Disk