What the title says. This makes it easy to keep neat stacks in an orderly fashion in the original game box. Customizable in its entirety. Variable names are self describing and source code is commented. Defaults are for sleeved cards with a 1 mm margin for easy insertion and removal. Material thickness is set to 1.5 mm for excellent results with 0.5 mm perimeters. Pieces grip together to form an array of slots.