Kyosho 0.95mm 3-Shoe Clutch Springs. These optional three-shoe clutch style (0.95mm) springs are intended for Inferno MP7.5 and Inferno MP777 platforms to provide racers with an extra tuning option! The bigger the spring, the stiffer it is and the later in the RPM range the clutch will engage. The smaller the spring, the softer it is and the earlier in the RPM range the clutch will engage. Package includes three 0.95 clutch springs.