Sold as a Two Piece Set. This is real metal chain with top quality plating to last for years. Adjustable back strap allows this to fit most. Includes padlock and key for closure in the back. Make it fit as snug as you wish for pressure and restrain in just the right places! (Hint, warm this up in warm water and dry with a towel before you put it on, unless.. you like that feel of cold metal against your skin.....)