As supplied with each NL100AK AC Preamplifier Headstage The NL973A – NL100AK Headstage Accessory Kit comprises: 2x 1mm gold pins with wire attached, 1x 1mm pin, 2x heat shrink tubing, 1x 2mm plug, 1x “U” shaped jumper (1mm pins) with wire attached & 1x Allen key.