Our product is a premium extruded polystyrene foam. It is "quarter inch" (6mm) thick, 2 lb/cuft density, smooth, flat, unperforated, unskinned and pure white in color. It has a fine, consistent cell structure, which forms and sands extremely well. It's less brittle and more flexible than other commercially available modeling foams. It can be cold formed to gentle curves and with additional heat from a hot air gun, can be formed to extremely small radii. It can be CNC machined and laser cut with precision. We supply two sheet sizes: 24"x48" within the United States and Canada and 8"x40" for shipping to other countries. This smaller size meets international shipping restrictions and ships for actual weight. We have found that the lowest shipping cost is achieved by shipping individual boxes, so even though you may order multiple boxes (discounts apply for orders over 4 boxes) they will be shipped separately.