The Straightline Performance Ski-Doo TRA Primary Clutch Spring is manufactured from premium high-tensile piano wire and features a double-preset, double shot-peened, and fully stress-relieved construction for unmatched durability and consistent clutch performance. Finished with a long-lasting powder-coated coating and backed by a lifetime warranty, this spring is designed to maintain its calibration season after season for trail, mountain, and racing applications. Starting compression: 2.90" (74 mm). Ending compression: 1.60" (41 mm).