1 40mm Citadel round base

you can find it on the web

rapidly outflanking and encircling the heaviest enemy vehicles – even enemy aircraft are not safe

4 in-world

There are also different build options for the crew

Rectangular SELF-ADHESIVE Base - 50x75mm - 10 units - Green Stuff World Tamiya 1 40mm Citadel round baseMagnetic Sheet SELF ADHESIVE Self adhesive flexible magnetic sheets provide a quick and simple way of magnetizing your wargames units without the necessity of drilling bases and gluing magnets. Square, rectangular, round, and oval most common shapes are available in a variety of sizes, but also as complete sheets to be cut to convenience with a pair of scissors or a craft knife. Use them alone, together with our rubber steel sheets, or together with