SECONDARY DRIVEN SPRINGS: 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.RED 2 1/2\" LOAD 54; 1 1/4\"" LOAD 115."