Produces a quick up-shift and improved back-shift for excellent throttle response Dual-angle-option helix offers fine-tuning for changing conditions Available in a variety of multi-angles for almost any application ER Helixes are for Ski-Doo and Polaris machines with engine reverse Helixes for Tied and TSS-04 clutches are NOT interchangeable Made in the U.S.A.. HELIX TEAM TWIN-TRAX ER