Features： 1、Aluminum alloy disc, CNC cutting, unique weight reduction treatment, it will not add unnecessary burden to the bicycle. 2、Positive and negative teeth discs are not easy to fall off, and the bite force is strong. 3、Unique mud discharge oblique mouth prevents the accumulation of sediment and prolongs the service life. 4、Anodizing treatment will generate an oxide film on the aluminum surface, which effectively protects the aluminum alloy body. 5、With Anti‑corrosion and anti‑rust treatment, it can be long‑term used without fading. 6、It is compatible for SARM GXP crank 8‑11 speed chain, direct mount crank bottom bracket. Specification： Item Type: Direct Mount Single Chainring for GXP Material: Aluminium Alloy Diameter: Approx. 151mm / 5.9in Positive Teeth Thickness: Approx. 3.7mm / 0.1in Negative Teeth Thickness: Approx. 1.9mm / 0.1in Disc Thickness: Approx. 10mm / 0.4in Offset: Approx. 6mm / 0.2in (The bottom bracket part of 68mm / 2.7in-73mm / 2.9in chooses offset 6mm / 0.2in) Product Weight: Approx. 107g / 3.8oz Package List： 1 x Direct Mount Single Chainring for GXP