I've used formica samples from one of the BBS and my own copper wired burning tools, but never quite satisfied with them...Haven't tried 'piano or guitar wire' but not sure I want to go the expense of using those unless someone has a better and less expensive idea... Also, I ALWAYS use two handles on either end of my copper wire as I'm terrified of loose, hand held wire becoming tangled and cutting off a finger or two when turning.... Any advice/suggestions are appreciated!!! Safety FIRST!!! Safe turning to you all!