Amaco's Balsa-Foam is different from other plastic foams because it can be easily carved with traditional and non-traditional hand tools to create the shape and design you want. It can then be decorated with any paint just like balsa wood. Balsa-Foam has no memory or rebound, it will hold an impression. This means you can create detailed shapes by simply pressing any object into the surface. A steel ruler can be used to make push cuts as a way to cut out more complex interior shapes. Carving knives and chisels virtually glide through BalsaFoam(density of 5 lb. per cubic foot). Available in three sizes.