Barrel reins are one continuous rein going from one side of the bit to the other. Barrel racing reins are perfect for speed events as you can't drop your rein. Braided barrel reins, nylon barrel reins and leather barrel reins are all popular material choices. Barrel reins come in a variety of colors from hot pink to plain black. Barrel reins come in 8 foot sizes but can come in 7 foot variety as well. Barrel reins normally have a clip on one side. This allows you to unhook your horse and lead it.