PRIMARY DRIVE SPRINGS: SKI DOO MANUFACTUREDFROM THE HIGHEST QUALITY MATERIAL FOR DEPENDABILITY. ALLOWSYOU TO FINE TUNE THE SHIFT HOLE, SIDE LOAD PRESSURE AND FULLSHIFT OUT POUNDAGE. ALL EPI SPRINGS LISTED ARE MANUFACTUREDWITH A 5% TOLERANCE. SHOT PENNED FOR DURABILITY.BLUE 2.9\" LOAD 240; 1.6\"" LOAD 390."