Mixed colour polystyrene sheets 15mm thick packs of 50 c r clarke 7501820p 515 x 464mm mixed colour 15mm thick polystyrene plastic sheets for use with the c r clarke model 750flb vacuum former and the c r clarke model 1820 vacuum former c r clarke 7501820p mixed polystyrene sheets 515mm x 464mm x 15mm pack of 50