Skunk2 (541-10-1100) Pro ST Coilover for Miata The Pro ST Coil overs come equipped with front 8 kg/mm and Rear 6 kg/mm springs ideal for daily driving/street use conditions Skunk2's micro-polished, mono-tube design and one-piece, forged shock bodies, combined with its precision-machined, oversized shafts and pistons, ensure that each Pro-STCoil over is both responsive and durable 12-way shock valving adjustability offers the perfect balance between daily driving/street use and track performance