The XCg bash guard mounts directly to the bike frame to protect the crank and chainrings from damage.Features:Nylon skid glides over rocks Sturdy aluminum backplate for extra durability and stiffnessSpecifications:Defined Color: Black Color: Black Material: Polycarbonate Mount Type: ISCG-05 Max Tooth (teeth): 32 Chainguide Mount Type: ISCG-05