From their website:
Ideal for a display base or something different for your models to be stood on.
ideal setting for a sci-fi or spaceship theam plenty of bases metal flooring and extra detail.
Cast from Polyurethane resin, these bases can be filed, drilled and painted on and are a great way
to make your miniatures look even better!
These bases may require that you clean them in warm soapy water to remove
any left over residue from the casting process.