Polystyrene Ball 200mm diameter in 2 hollow halves that slot together. Polystyrene ball 2 part type, 150mm diameter. Quality white polystyrene ideal for sweet or candy trees, 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.