1、Diverse Features: Bike oval disc chainring, has good compression resistance, waterproof, not susceptible to moisture, rustproof, long term use. 2、Manufacturing Material: Made of high quality aluminum alloy material, it is strong and durable, which undoubtedly extends its service life. 3、Positive and Negative Teeth Design: The design of positive and negative teeth, using thick and thin design, so that positive and negative teeth of the plate just match the outer and inner chains of the chain, which can solve problem that the chain would be dropped without forward dial. 4、Integrated Molding: Integrated molding, CNC cutting, precise tooth shape, not easy to drop the chain, perfect for your outdoor cycling. 5、Simple Operation: Simple to operate, easy to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time. Item Type: Oval Disc Chainring Weight: Approx.302g / 10.7oz Material: Aluminum Alloy Product Style: 56T (110/130 BCD) BCD: Approx.110mm / 4.3in, Approx.130mm / 5.1in Speed: 7/8/9/10 Speed Product Application: Road Vehicles, Folding Vehicles 1 x Bicycle Oval Disc