good luck....if you want to polish marbles...get some hand polishing pads or one of those machines...the machines take several hours to get a final polish...theres lots of steps to it ...several different grits ....theres people who specialize in it.....a dremel goes way too fast to accomplish what you want......youll end up with facets and flat spots....to polish a marble is a very tedious endeavor.....you can clean em but to get the fine wet surface takes a lot of time...and practice and several types of polishing agents.....the first step takes it down to a scratched up ball....patience is really a virture in this.....why do you suppose they made those machines....its been tried by practicaly every marble collector...me included and believe me or not, its hard and not much fun....like i said...good luck!!!