This simple yet effective collar encourages the wearer to maintain perfect posture with their chin up and head back. The 88mm (3.5 inch) height of the collar keeps the wearers neck rigid thereby forcing him or her to stand up straight. Handsewn in black leather these serious disciplinary tools also have attached nickel plated D-rings for leashes or chains. Collars are closed by means of two buckles on the back.