OYTRA BASIC SERIES Polymer Clay 250 gram each White and Black Coloured Oven Bake Clays Perfect for jewelry, home decor, mixed media, seasonal items and more! Bakes hard and takes on a matte, bisque type finish. Shape, bake and once cool can be sanded, drilled, carved and finished It is soft and pliable, works and feels like ceramic clay but will not dry out when exposed to air.