Prang DAS Air Hardening Clay is an excellent modeling clay for art projects. This clay hardens in 24 hours and then is usable with any type of decorating medium. It is super pliable yet allows you to produce a permanent work of art, and doesn't require oven baking , but provides ample open time to complete projects before hardening. Available in White or Terracotta. (Air Hardening - Doesn't require oven baking, air dries in 24 hours).