Bulk 19 Inch Square Polystyrene Dummy Cake Foams 4??Inch High Styrofoam 10 pack – Great for your cake decorating ideas. Can be used in many forms for lolly buffet tables, dummy cakes, craft etc. Best price, grab it today. Polystyrene Dummy cakes come in handy when building tiered cakes without the hassle and worry of the weight and also when not necessary to feed hundreds. Also useful for building sample cakes with longevity. Our dummy styrofoam can be cut into different shapes using a electric carving knife.