The FUCHS Silkolene RSF range (formerly known as Pro RSF) has replaced their standard Fork oil Counterparts. Our premium high performance RSF range, available in (2.5, 5, 7.5, 10 & 15 W) is a race/road/track proven suspension fluid already in use and chosen by many of today’s market leading suspension manufacturer’s and currently already used as original equipment in many of today’s modern motorcycles.