Applicable: Applicable to most Chinese GY6 250cc karts and scooters with 16T splines. Dear customer, please check the model or size before placing an order. Reminder: After receiving the product, please check whether the product matches the product you selected. As a reliable seller, you can rest assured to buy our products, hoping to bring you a perfect shopping experience. Note: The rear drive pulley assembly must be correctly tightened to the vehicle to prevent malfunction. According to the original factory specifications, the old or damaged ones can be directly replaced, which is easy to install. High-quality material: It is made of high-quality steel alloy material, with high strength, high hardness, and non-deformation characteristics. It has good wear resistance, corrosion resistance and aging resistance, rust resistance and long service life. Stable performance: It strictly conforms to product production standards, professional manufacturing, fine workmanship, reliable qualit