The tungsten 4mm bead from taska is the ideal tool for a number of rigs although the preferred rig is the shocker tapered inside to ensure that it fits well over a core zero or other leader the bead is placed about 6 up so when the carp picks up the hook bait and feels no resistance he moves off this causes the lead to come into contact with the bead and forces the hook to return back designed to keep everything on the bottom the bead is heavy but still soft enough to slide off the leader