40mm diameter bases numbered 1-5 with a front-arc built in. Inner diameter is 31mm, same as those used in miniature wargames such as Warmachine and should fit any base inserts well. 4mm at the tallest lip edge, 3mm lower lip edge, 2mm thick in the center with 1mm raised numerals. **Update(8/15): I thought it would be useful to have bases without the numbers on them, so I added "40mmBlank.stl" to the set. This is the same thing but without the roman numerals. If you want a full set of 30mm scale bases check out my base collection: http://www.thingiverse.com/thing:134019Step 1) Print Step 2) Enjoy