These springs are built to be utilized regarding super brief big bore dampers (Item 42305) that debuted regarding TRF419X. The set includes 3 different stiffnesss, always swiftly change your setup. Brief Spring (smooth) x2 Brief springtime (moderate) x2 Quick Spring (rough) x2 Marking sleeves for hard (yellow) and soft (red) x2 each Free size: 20mm right for super brief big bore dampers.