T1RS-G23 Mod-Twin 10.5 HD Sprung Race Kit performs aggressive launches and smoother shifting in high-powered machines by combining twice the ceramic friction surfaces with an ultra-durable sprung Mono-Drive hub assembly in a completely modular design. Each diaphragm spring endures an exclusive four-stage heat treating process providing a consistent light pedal feel. Puck-style Friction Plates with high quality ceramic friction materials deliver high friction coefficient superior heat capacity and long clutch life. These Friction Plates uniformly transfer torque to a Mono-Drive sprung hub assembly which extends input shaft life and reduces driveline shock from torsional vibration. This kit includes a CNC-machined and dynamically balanced flywheel pressure plate cover diaphragm spring face puck-style ceramic friction plates sprung Mono-Drive hub assembly floater patented Monoloc Collar release bearing alignment tool and pilot bearing (where applicable). Mod-Twin clutches are fully rebuildable and replacement discs may be ordered separately.