Malossi Maxi Fly Clutch Kit for 400cc – 500cc Aprilia, PiaggioSPECIFICATIONS: Clutch Bell forged using Fe DC04 deep-drawing steel;Carbon steel centre hub made of round stock and TIG welded;Anti-vibration band welded using a 3 point 120?? pattern;100% dynamically balanced;Surface hardened through nitriding.COMPATIBILITY: Aprilia – Atlantic 400, Scarabeo 400BMW – C 400Gilera – Fuoco 500, Nexus 500Malaguti – Spidermax 500Peugeot – Geopolis 400, Satelis 400/500Piaggio – BV 400/500, MP3 400/500, X8 400, X9 500, XEvo 400 Fly Clutch is a reinforced centrifugal clutch designed to easily withstand extreme operation, for example, constant stop and go on steep roads, city traffic, long series of traffic lights, especially with a passenger, and during hot weather when it becomes difficult to control scooter temperature levels. **