Many sculptors desire an extra-firm clay that can be carved to shape, as subtractive rather than additive sculpture. Super Sculpey Firm delivers, achieving a carving medium that bakes in a 275Â° oven, which can then be polished, sanded, drilled, further carved and painted with acrylic colors. Super Sculpey Firm also maintains details exceptionally well, and is gray in color so those details show in photographs. Available in a 1 lb. block.