There are six 'sets' at the moment with the potential for more in the future. There's also a bag of ten 40mm spare bases available if you want to have something else but not have another set of sabot.

Lasered from 2mm mdf and in two layers. The top layer is 5mm inset from the bottom and they come supplied loose. Holes are 41mm in diameter. 40mm diameter bases are supplied with each set.

I would suggest chamfering the edge once they have been stuck together to help them blend into the table top a bit more.