Special Edition Miniatures from Reaper are just that, Special. Miniatures they produce in limited quantities for ReaperCon. Or Special Edition Miniatures for specific events. Some are different scales, one is a Resin Bust, but all don’t really fit into a specific catagory.
Some are metal, others resin and some are different scales like 54mm and 72mm. If in doubt, contact me and I’ll try to find out for you.