its literally a handfull of wires, and if you buy a stupidly prced hks kit for instance, you get a purple ring piece where all the wires attatch to.. waste of money for a branded kit, go to an audio shop, get some nicely sized gauge amp power wire, and make your own.. you can get junction blocks from there too, polished if your fancy. one line goes to battery earth into the junction block, then comming out of the other ports on the block the amp wires go to the chassis earthing points. it just means your getting a better earth rather than the tiny little earthing wires as standard. do as ecks said and make a custom one for peanutts.