The toothed chain of this product sprocket threads smoothly and also saves a lot of energy. When the links are activated, the teeth minimize impact and contact stress. It can perfectly replace and repair the worn-out damaged gear wheel in the original car, allowing you to have a better driving experience. This product is made of high-quality alloy steel. Oil-resistant, abrasion-resistant, and long-lasting. Easy to install and replace the broken one, no special tools needed. Made of good material, durable, not easy to rust and not easily deformed,for long time to use.