High security belly chain comes standard with Model 100 satin nickel handcuffs. Smith & Wesson Handcuffs are fabricated from the finest quality carbon 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.