I have designed these bases to provide an aesthetically-pleasing alternative to rectangular bases for TtS! games on a 100mm (4") grid. The irregular edges (which can be chamfered or sanded to give a lower profile) have a naturalistic look which blends much better with a base cloth than do rectangular bases. They are cut from 2mm MDF. 3mm diameter magnets (supplied separately) can be fitted into the holes to secure them in storage or transport. 

This pack includes four deep unit bases (two slight variants), each approximately 90mm wide by 50mm deep, designed primarily for use with a 10cm grid.