These are by far, the highest quality and lightest weight wheel spacers on the market.  Designed specifically to fit your Porsche, all sizes use a hub-centric design, accurately locating both the spacer and the wheel to the hub, for a perfect vibration free and balanced system.  Precision CNC machined from aerospace quality 6061-T6 aluminum, and optimized lightening features, then finished with an attractive corrosion resistant black anodize plating.  Available in 3mm, 7mm, 15mm, and 19mm sizes.  Fits all Porsche 986/996/987/997/991/981 models with race studs or factory bolts.  Sold in pairs.  Note: 7mm size doe not fit 991/992 GT3 or 981/718 GT4