1、Aluminum Alloy: Using high strength aluminum alloy, the chainring has good compression resistance, waterproof, moisture proof and rust proof. Thick aluminum material is strong and durable. 2、Narrow Wide Chainring: The design of the narrow wide teeth, one thick and the other thin, makes the narrow and wide teeth of the disc coincide with the outer chain and inner chain of the chain, which solves the concern that the chain will fall if there is no front derailleur. 3、CNC Cutting: The oval chainring adopts CNC cutting and integral molding. The precise tooth shape design is not easy to drop the chain, which greatly improves the efficiency of riding. 4、Anti Oxidation: Anode coloring treatment, a film is formed on the surface of the chainring, which greatly enhances its anti oxidation ability and prolongs its service life. 5、Wide Application: 110/130mm BCD 54T oval chainring for 7 8 9 10 speed is has a wide range of use, and is suitable for road bikes and folding bicycls. Item Type: Bicycle Oval Chainring Product Style: 54T (110/130BCD) Material: Aluminium Alloy Product Color: As Pictures Shown BCD：110/130mm / 4.3/5.1in Product Weight: Approx. 280g / 9.9oz Speed: 7/8/9/10 speed Product Application: Suitable for road bikes, folding bikes 1 x Bicycle Oval Chainring