J2 Engineering J2-COIL-9300-WS For IS200/IS300 Altezza 32-Way Adjustable Coilover Damper Spring (White) High Quality CNC Machined Steel (Springs) And Aluminum (Shocks) Construction 32 Levels Of Dampening Adjustment (Compression/ Rebound) On Rubber Dust-Covered Stainless Steel Construction Sleeve Pillow Ball Upper Mounts With Rubber Dust Boot Covers And Dual Locking Spring Perch Applied 46mm Mono-Tube Shock Design / Independent Full Height Adjustability Through Shock Body, Not Spring Like Other Providers Front Spring Rate: 12kg/mm / Rear Spring Rate: 10kg/mm