The card slot is a single saw kerf in width. The cards are printed on only one side with the white side used as a standard background to describe color and for tasting blind. The printed side identifies the whiskey and tasting notes. I'm still trying to tease flavors from the different pours so I thought I would compare some different types of whiskey and a decent rum in this round. Lots of possibilities, probably try the different regions of Scotland next or do a flight emphasizing different level of peat.