The tube is made of alloyed high-strength steel, ideal for replacing or upgrading from OE/Brembo calipers. Since the tube is made for multiple applications, so the fitment may not be perfect and may require some field adjustment to install. Caliper Cross-over Tubes for Mercedes C63, Corvette C7 ZR1 (Not C6 ZR1) Camaro G5 Z28/G6 ZL1 (Not G5 ZL1 or G5/G6 SS) & Audi S6/7/8/A8 Front 6 Pot Calipers (Priced and sold in pair)