Special nontoxic, non-hardening polymer clay comes in a one pound package containing 4 colors. Can be readily worked with hands or tools to create simple or complex projects. Once complete, projects retain their shape indefinitely or can be re-worked as the imagination dictates. It never hardens so you can use it again and again. There's also no needed to wrap or cover projects from session to session. So start a dino today, finish it next week!