Tooth size: 38T / 160mm, light weight: 72g (38T), suitable for different types of bicycle cranks with a BCD of 104mm Material: Made of high quality anodic oxidation 7075 T6 aluminum alloy, aerospace strength. Rigid 4 mm plate thickness to ensure no sagging. CNC precision process: precision machining and anodic oxidation plating, smooth surface of the medals, bright color, non-faded and corrosion resistance. Narrow 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 noise. Compatible Model: Suitable for most SHIMANO and SRAM cranks. Please determine your crank BCD specification carefully before purchasing Product description Specification Material: 7075 T6 aluminum alloy Shape: Round Size: 38T Compatibility: 9/10/11 speed t BCD: 104BCD Weight:72 g Scope of delivery: 1 x chainring Feature: 1. The new, narrow, wide tooth design increases chain retention, service life and reduces friction and noise. 2.Super durable and lightweight 3. Easy to install and fits the 104mm bolt pattern perfectly. Installation note: This chainring fits for 9/10/11, not for xt M8000 Please determine your crank BCD specification carefully before purchasing.