Picked this up from Reaper minis when getting a refill on bases (I like Reaper round bases). The material is plastic from the Reaper Bones line.
Reaper Bones. What can I say, they are awesome. Very little to zero assembly required. Just a couple parts and went together very easily. Mould lines were easy to remove.
Primed with Badger Stynlrez primer, brushed on. Miniatures painted purley in oils. Took about 3-4 hours total with futzing with the colors and OSL. Sealed with some matt varnish from Reaper Miniatures.
Custom cork with joint compound, topped with skulls. Everything was covered in a mixture of Mod Podge and black acrylic paint, then painted in oils.