PRIMARY DRIVE SPRINGS: ARCTIC CAT & POLARIS. 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.BLACK 2 1/2\" LOAD 145; 1 1/4\"" LOAD 280."