Features: Premium Material:This is a chain made from t6 cnc aluminum alloy. Chainring uses t6 aluminum alloy, which effectively reduces the use and deformation of the chain while riding. Wide, Narrow Teeth :teeth design can effectively reduce the chain drop and make the chain smoother. Light Weight:The original shi-mano chainring weighs about 140g, while the chainring weighs only 67g-90g, which greatly reduces the riding load Electroplating Polishing Design:Compared to the original shi-mano chainring, the The surface of the chainring is galvanized and polished, which is not prone to scratches and increases the appearance. Satisfactory Service:Contact us if you have questions,we will try our best to servive for you. Specifications: Material: ultra-light aluminum alloy Fit: Shi-mano 12 speed m6100 (new) / m7100 / 8100/9100 (Please confirm the model before buying to ensure you can use it) lo) Type:32T/34T/36T/38T Size: 17x17x1cm Note: Please allow 0-1cm error due to manual measurement. pls 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: 1 Pcs 12 speed chainring.