Although only accessories, the 4 mm cables are nice in several ways. with the 90 degree heads, they stay tight to the electrodes and do not result in bulges under clothing, additionally when combined with the proper type chastity device, it was easy to modify such that they are firmly held in place and are unable to be removed by the wearer. Even on their own, the large insert-able pins are nice and snug, actually requiring you to use a considerable amount of pressure tension / pulling to remove insuring they will not fall out on their own. My only wish is that at the unit end, a choice of terminator would be given including a standard medical US medical EMS/TENS/IF etc. ending or adapter could be available...