Taylor Lead Lounge standard back leads are used to clip onto your line after you have cast out, and they are designed to slide down to pin your line to the deck. If fishing a water where you're catching on multiple rods, using back leads will give you peace of mind that whilst playing a fish, the line on your other rods are on the deck and out of the way. The other advantage of pinning your line is to prevent birds feet from getting tangled as they pass over your rods or spooking passing carp as they leisurely cruise around.