Features:100% brand new and high qualityCHAINRING-Narrow Wide Offset 3mm Bicycle Chainring For MTB bike GXP XX1 X9 XO X01 NX XX GX X1 GXP11 CNC AL 7075 Crankset Chainwheel Parts. The Versatility of the Chainring, Stop dropped chains, install simply. CNC high speed engraving and milling hard oxidation treatment , In order to let you enjoy the ride, it is ideal to choose the quality CNC machining integrated, intensity is great, appply for long time cycling. Extended edition plus or minus tooth shape, the chain can effect better Chainring is made of premium alloy structure, lightweight but sturdy. with positive and negative (The positive tooth corresponding chian tooth width; tooth corresponding negative chain is narow ), teeth designed to prevent the chain from dropping The bicycle chainring made of premium materials can maintain a smooth surface, bright colors, fade, and corrosion resistance. It is easier to clean than traditional chainring and will make your bicycle more beautiful overall Unique inclination angle, unique shape, unique mud discharge oblique mouth, unique weight reduction treatment. Package Includes:1 x Bicycle Chainring. Specifications:Material: 7075-T6 Aviation Aluminum AlloyThickness: Disc 7mm; Positive Tooth 3.6mm, Negative Tooth 2.0mmNumber Of Teeth: 30T 32T 34T 36T 38T 40T Process: Cnc High-speed Milling + Hard Oxidation TreatmentCompatible: Speed Lian Middle Lock GXP Crank 8~12 Speed Chain note:Please allow 0-1cm error due to manual measurement. Make sure you do not mind before you bid.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!