Polystyrene flat backed or half ring, quality white polystyrene ideal for model building, or can be painted or decorated in numerous other ways. Can also be used as a base for covering in clay, paper mache, etc. Do not use solvent glues with polystyrene, PVA white glue, special poly cement or low heat glue guns are fine. Overall diameter 250mm, the hole in the middle is 137mm.
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