Function- Ergonomic oval shape allows efficient use of the ampede to create better traction, reduce leg and knee strain and fatigue, and ensure smooth cycling More without effort - The unique tooth design increases the contact area with the chain, which can increase gripping strength and reduce chain waste, allowing you to pass the bumpy road easily Product Benefits- The design of positive and negative teeth makes it unnecessary to install a guide bar or worry about losing the chain. 104mm crank length chainring is suitable for AM/XC models to modify single discs.Compatible with bicycle crank with 104mm BCD Quality material- The e bike chain made of high quality aluminum alloy, lightweight but very durable. The correct thickness does not guarantee sagging. High and reliable performance, easy to ride. Quality Material- The e-bike chain ring is made of high quality aluminum alloy, lightweight but very durable. The correct thickness does not guarantee sagging. High and reliable performance, easy to ride. Quality Material- The e-bike chain ring is made of high quality aluminum alloy, lightweight but very durable. The correct thickness does not guarantee sagging. High and reliable performance, easy to go.