Malossi uses the best materials for its shaft seals. They consist of steel cores covered with fluorocarbon rubber (FKM/FPM). Due to the increased alcohol content in today's fuel, shaft seals with this material are recommended. In addition to their enormous resistance to wear, they run with low friction, which makes them a must for all higher-speed engines. Also in the PX engines, the clutch-side large shaft seal of the crankshaft is made of such a material (brown sealing lip).