S-Caliper aluminum piston made from 6000 series aircraft grade aluminum machined to the specs of the original piston and then hard coat anodized to yield a finish second only to garnet and diamond. The aluminum will not react with the steel and promote corrosion unlike the steel versions. It's a great way to lighten your vehicle by up to 8 lbs when changing out a complete set. As original manufacturer of the anodized version of these, we were the first to realize this was a significant improvement over the original, they will never corrode again!
Used on Porsche 911T/E/S (1965-'70). 4 required per axle, 8 required per car.