Features:1. Made of quality materials with fine machining and precise assembly. 2. The hall sensor has multiple advantages like compact size, light weight, long durability, anti-shock, anti-corrosion and dustproof, good for assisting electric bicycles. 3. The 1:1 assist sensor works well for pedal-assist electric bicycles drive system, save your labor while pedaling. 4. Suitable for almost all electric bicycles available in the market. 5. Easy to install and use, a good helper for your electric bicycles. Specification:Material: Steel Type: Hall sensor Magnet Quantity: 5 pcsColor: Shown as picture Size: Dia. 6.5 cm / 2.56 inchSuitable for: most electric bicycles Weight: Approx. 50 g Package List:1 * Bike Pedal Assist Sensor 1 * Magnetic SheetNote:Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering..