1、Aluminum Alloy Material: High strength and thick aluminum alloy, good compression resistance, waterproof, moisture proof and rust proof, sturdy and durable. 2、Positive and Negative Teeth: The design of the positive and negative teeth, one thick and the other thin, makes the positive and negative teeth of the disc coincide with the outer and inner chains of the chain. 3、Good Performance: The design of the positive and negative teeth of bike oval chainring, solves the concern that the chain will fall if there is no front derailleur 4、Good Workmanship: One piece molding, CNC cutting, precise tooth shape, not easy to drop the chain. Exquisite workmanship and beautiful appearance. 5、Applicable Model: Oval chainring is suitable for road bikes and folding bikes. Convenient installation and operation, providing you a good using experience. Item Type: Bike Oval Chainring Product Material: Aluminum Alloy Product Style: 58T (110/130BCD) BCD: 110/130mm Speed: 7/8/9/10 Speed Application: Road Bikes, Folding Bikes 1 x Oval Chainring