Features: brand new and high quality Aluminum alloy forging, strong impact resistance, uniform stress and smooth driving. Surface anodizing protect the aluminum alloy main body and prevent the surface from oxidation prevention and oxidation effectively. Unique mud discharge ramp to prevent accumulation of sediment and smooth running of teeth. Arc cutting angle, positive and negative narrow wide tooth profile design, reducing chain wear, strong bite force, not simple to loosen the chain, and efficient transmission. It is for sarm(connex), crank speed chain of gxp/8-11, direct/dub mounted crank for mounting frame 148. Specifications: Material: Aluminum Alloy Offset: 3mm Specification: 32T 34T 36T 38T 40T 42T Colors: Black Red (as Shown in The Picture) Compatible With: Gxp Crank 8/9/10/11 Speed Current Technology: Integrated Turning and Milling/anodizing 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 Package includes: 1x Bicycle Chain Ring.