This Stainlees Steel handcuff is perfect for punishing saltwater or humid enviroments. Smith & Wesson Handcuffs are fabricated from the finest stainless steel. They are manufactured with heat treated internal lockworks, featuring smooth ratchets for swift cuffing and double locks to prevent tampering. All S&W handcuffs meet or exceed demanding U. S. National Institute of Justice tests for workmanship, strength, corrosion and tamper resistance.