Crown caps are the standard caps for most beer bottles.
You can reuse old beer bottles but make sure they are the heavy glass type. The ones that have a deposit on them are usually ok. The very thin ones that have cheap lager in them are no good.
You place the crown cap on a little magnet in the machine and pull down the two handles. It's easy and simple
Machine may vary from the photo a bit depending on what we have in stock.