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