HCR Racing Arctic Cat Sport 700 O.E.M. Stock Replacement KitARCTIC CAT SPORT CAT STOCK REPLACEMENT ARMS HCR uses the same custom alloy as their popular Elite kit to manufacture the Polaris Sport Cat Suspension. This proprietary material boasts 30% stronger tensile and yield strength compared to 4130 series chromoly. The material goes through several processes and is hardened for better wear resistance and overall strength.