BESTDOTEK Rovan RC 8000 RPM Clutch Kit [1]New Kit Includes: Clutch Shoes, Extra Spare 8000rpm Spring, Mounting Screws/Washers [2]Fits: HPI Baja 5B, SS, 2.0, 5T, 5SC (23cc, 26cc, 29cc, 30.5cc), Rovan Sport Baja Buggy, Baja Terminator, King Motor KSRC-001, KSRC-002, KSRC-003, T1000, T2000, Zenoah Engines. Also fits Losi 5ive T Trucks [3]This is a Great clutch for engagement at higher speed - 8000 rpm springs offers Faster Take off. [4]Kit Comes with Spare "8000 rpm" Spring. Fits all of the above 23cc, 26cc, 29cc, 30.5cces Engine Plus many more not listed.