ACT's race, twin disc kit offers twice the number of disc surfaces for better wear, heat capacity and long life compared to single disc kits. These kits use a proprietary Positive Lift Floater System design, which results in quiet operation with no floater rattle and no posts to wear. ACT's sintered iron race discs offer the highest torque capacity of all ACT race discs and have ultra-high heat capacity. ACT sintered iron race discs feature top grade rivets and are carefully selected for maximum strength. ACT sintered iron discs are extremely durable and heavy, and have very harsh engagement. All ACT twin disc kits include a CNC-machined and dynamically balanced flywheel to ensure trouble-free installation and operation. ACT twin disc kits undergo an exclusive four-stage, heat-treating process on all diaphragms. ACT twin disc kits include a pressure plate, two discs, a floater, flywheel and alignment tool. Some kits may include a pilot bearing and release bearing.