These are bases in 25mm, 32mm, and 60mm for use with One Page Rules Warfleets: FTL. A game of spaceship battles that can be played in 60-90 minutes. Though you could definately use them with other similar space warfare games.
These bases are clipped and scaled from jonaslepsoy's Ork Kroozer model. https://www.thingiverse.com/thing:3387849