MW calipers are all manufactured in house and are cast from the same alloy as the MW 9" Ford cases that have 30% more tensile strength than 6061 used in most billet calipers on the market. The exception is the 73002 2-piston caliper forfloating front disc brakes is machined from 2024 billet aluminum. Pistons are machined from billet aluminum and have been hard coat anodized.