Description: With anodizing process and excellent workmanship, the bike chainring has good texture and beautiful color. The product has been T6 heat treatment, CNC processing, which has lighter weight and higher strength, and the classic original silver main body make the disc more delicate. The positive and negative teeth alternate design makes the chain smoother and more stable, and it is not easy to fall off. The six diamond-shaped positive teeth and extended chamfered negative teeth make the bite force higher. The hollow design can not only reduce the weight of the disc greatly, but also can drain mud and water, which improves the riding experience. Made of high quality aluminum alloy material, the product is sturdy, wear-resistant, durable and has stable performance. The specifications of the product is 30T/32T/34T/36T/38T/40T, which is optional. It's suitable for Shimano M7100/8100/9100. Item Name: 12 Speed Disc Tray Material:Aluminum Alloy Compatible Models: for Shimano M7100/8100/9100 Craft: CNC Size: 30: 12.9cmx12.9cmx0.2cm/5.08inx5.08inx0.08in 32: 13.6cmx13.6cmx0.2cm/5.35inx5.35inx0.08in 34: 14.5cmx14.5cmx0.2cm/5.71inx5.71inx0.08in 36: 15.4cmx15.4cmx0.2cm/6.06inx6.06inx0.08in 38: 16.2cmx16.2cmx0.2cm/6.38inx6.38inx0.08in 40: 17cmx17cmx0.2cm/6.69inx6.69inx0.08in Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 X Single Disc Tray