Masking tape is one of those things that you do not know you need until you realize you do. Once you have a wall and your columns and/or swim-lanes are defined the masking tape does the work of delineating them.
The tape acts as the column and row dividers for your board. The masking tape sticks on any surface and is easily peel-able. It doesn't leave a residue after you pull it off and keeps stuck for long.
The masking tape has width of 1⁄2" and is of 60 yards.