Tooth size: 38T / 160mm, light weight: 72g (38T), suitable for different types of bicycle cranks with a BCD of 104mmMaterial: Made of high quality anodic oxidation 7075 T6 aluminum alloy, aerospace strength Rigid 4 mm plate thickness to ensure no saggingCNC precision process: precision machining and anodic oxidation plating, smooth surface of the medals, bright color, non-faded and corrosion resistanceNarrow wide toothing: The narrow wide toothing increases the contact surface with the chain considerably, so that each of the teeth can be fully inserted into the chain, ensuring the ultimate chain hold, increasing the service life and reducing friction and noiseCompatible Model: Suitable for most SHIMANO and SRAM cranks Please determine your crank BCD specification carefully before purchasingProduct descriptionSpecification Material: 7075 T6 aluminum alloyShape: RoundSize: 38TCompatibility: 9/10/11 speed tBCD: 104BCDWeight:72 gScope of delivery: 1 x chainringFeature: 1 The new, narrow, wide tooth design increases chain retention, service life and reduces friction and noise 2Super durable and lightweight 3 Easy to install and fits the 104mm bolt pattern perfectlyInstallation note: This chainring fits for 9/10/11, not for xt M8000 Please determine your crank BCD specification carefully before purchasingProducts from He Wei 's store