The purpose of German reins, also known as sliding reins, is to correct a too-high or misaligned neck position. When using German reins, you ride with 2 pairs of reins: bridle reins, which act directly on the bit, and German reins, which pass through the bit and attach to the girth.These reins come in two parts:- Nylon rope, highly resistant to wear and tear, for optimum sliding of the system through the bit rings,- leather for hand comfort.snap hooks are provided for easy attachment of the rein.a girth hook is provided for girths without snap hook rings.brass buckles.