7075 aluminum alloy is used, which has high strength, good compression , long-lasting stability, beautiful and generous products, and lightweight while maintaining strength The edge adopts anti loosening ratchet design, multi-directional protection, locking with the flywheel for more security CNC cutting, clear water caltrop, clear tooth pattern, no burr, high overall strength, locking without falling off It adopts the general standard specifications in the market, with strong compatibility, easy installation and high strength life Colour:Red+silver Material:7075 aluminum alloy Size:Bicycle Cassette Cog Diameter: 46mm Bicycle Cassette Cover Diameter: 35mm Package Contents: 1 x Bicycle Cassette Cog 1 x Bicycle Cassette Cover Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.