Movement trays for units of calvary in strategy wargames like Oathmark. These trays are based on standard 30 x 60mm rectangle bases. With a low profile (1/16") lip, movement measuring can still easily be done from the side of the bases.

All trays come with a full complement of matched bases and are available both with and without pre-cut magnet slots that fit 1/8" drum magnets

https://warsen.al/products/mdfmagnets