The product is a genuine Yamaha YZ 125 magnetic rotor assembly, with the manufacturer part number 4SS-85550-11. It is made in Indonesia and specifically designed for Yamaha motorcycles. This magnetic rotor plays a crucial role in the electrical and ignition system of the motorcycle, ensuring proper functioning and performance. Whether replacing a worn-out rotor or upgrading to a genuine Yamaha part, this product is a reliable choice for motorcycle enthusiasts looking to maintain the integrity of their Yamaha YZ 125.