Corvette Double Tall - Anti-Slip Jacking Pad/Puck - Billet Aluminum : C6 Z06, ZR1, C7 Stingray, Z51, Z06After we machine our Jacking Pads from 6061 T6 aluminum round bar, we then bead blast each piece for better wear resistance. Our Jacking Pads include Anti Slip Grooves on the bottom to help prevent slippage when properly used in direct contact with a metal floor jack or lift. In addition, they are built taller to compensate for larger hydraulic floor jacks. The quality of these are head and shoulders above the competition. Note: Buyer beware that it