290 mm diameter expanded polystyrene ball. Supplied in 2 hollow halves. Our high quality moulded polystyrene balls are great for creating projects such as solar systems, heads, chemistry models, bases for clay and paper mache work – or even just a pumpkin or the body of a spider. Provided in plain white polystyrene, these balls can be easily painted, pinned, sequinned, glittered, feathered or glued (please note: a solvent free glue must be used otherwise the adhesive will eat the polysytrene). All our polystyrene balls contain a flame retarding additive, however in the interests of safety they should be kept away from hot lights, hot surfaces and naked flame.