1,7075 Aluminum Alloy Material: 7075 aluminum alloy material, high strength, corrosion resistant and rust resistant, durable. 2,Integrated Protection Plate: Integrated protection plate, effectively protect tooth plate, do not roll trouser leg. Petal shape, more beautiful. 3,Anodic Coloring: Anodic coloring will form a film on the surface of the plate, which greatly enhances its oxidation resistance. 4,Integrated Molding and CNC Cutting: Integrated molding, CNC cutting, precise tooth shape, not easy to drop the chain. 5,Simple Operation: Simple to operate, easy to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time. Item Type: Five Holes Chain Wheel Disc Weight: Approx.230g or 8.1oz Material: Aluminum Alloy Number Of Teeth: 58T Product Diameter: Approx.245mm or 9.6in 1 x Bicycle Tooth Plate Note: 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.