I designed these bases for infantry battalia in For King and Parliament, and less deep units in TtS! They are cut from 2mm MDF; 3mm diameter magnets (sold separately) can be fitted into the holes to secure them in storage or transport. The edges of the bases can be chamfered with a craft knife and the naturalistic appearance of the wobbly edges helps them to merge into the playing surface. 

This pack includes three bases, making a unit 19cm wide for use with a 20cm grid. The FK&P13e bases are approximately 63mm wide and 22mm deep. They have a very similar profile to the FK&P6a.