Material: 6061 T6 Aluminum. Surface: Anodized. Prevent brake disc collision. Protect your rear rotor from rocks and stumps. The all CNC billet aluminum design replaces the original cast aluminum caliper mount for more strength and longevity. Includes spacers for mounting up to a 220m rotor, and is full size to protect that rotor upgrade as well. Rear spacer catch is slot cut to allow for easier rear wheel removal.