Comstock wire triggers have been redesigned for much easier installation! The new style of trigger wires simply hook on to the swing bar rather than being fed through it. This new style is safe for animals and also reduces the amount of trigger wires damaged by trapped animals. Replacement trigger wires for the 12″ x 18″ cage traps packaged in three, six, or twelve packs. This part is made from 14 gauge spring wire.