This is the linear tuned spring set from Hot Racing .
Features: color of spring corresponds to amount of dampening effect enables shock to properly react to different track conditions you will receive: four each silver(med), blue(hard), and red (soft)front springs requirements: installing on shock assembly specifications: spring length: 17.8 (8 coil) od 9.5mm id 8mm red (wire 0.4mm) silver (wire 0.5mm) blue (wire 0.7mm)
