These springs are made for use regarding the super brief big bore dampers (Item 42305) that debuted regarding TRF419X. The set includes 3 different stiffnesss, which you can use to swiftly alter your setup. Short Spring (Soft) x2 Short Spring (Medium) x2 Brief Spring (Hard) x2 Marking sleeves for hard (yellow) and soft (red) x2 each Free length: 20mm appropriate for super short big bore dampers.