These springs are designed to be used regarding super brief big bore dampers (Item 42305) that debuted regarding TRF419X. The set includes 3 various stiffnesss, constantly swiftly improve your setup. Brief Spring (smooth) x2 Brief springtime (moderate) x2 Quick Spring (rough) x2 Marking sleeves for difficult (yellow) and soft (red) x2 each Free size: 20mm suitable for super brief big bore dampers.