Formula Style secondary spring with tabs for wind up style Ski-doo clutches that use formula and QRS cams. The HRSS BLACK spring is a favorite replacement for the Ski-doo beige. The HRSS ORANGE spring works well on the Ski-doo torsional 4 strokes as well as prostock drag applications. The HRSS GREEN is a great drag race spring with higher side pressure but can be set to open quicker for a quicker initial upshift. All HRSS QRS helix's are pre-drilled for torsional tabs and adjustable for preload and work with these springs.