Gearmaker.org PALS marker made by Whiskey Two Four. Holes are spaced 1.5" horizontally and 2" vertically. Multiple hanging holes around the perimeter and a carry handle permit safe transport and storage. 14 columns x 8 rows.
Laser cut from .120" cast acrylic. If you put effort into breaking this, you will break it. If you treat this as the tool that it is, this will serve you well.