The product is a new OEM Yamaha 1st wheel gear with a 31T teeth count, designed for use in Yamaha YZ250 and WR250 motorcycles from 2015 to 2019. The gear is specifically manufactured by Yamaha with the part number 2GB-17211-00, ensuring a perfect fit and quality construction for optimal performance on the bike. This component is essential for maintaining the proper gear ratios and ensuring smooth operation of the motorcycle's wheels.