A pleasant way to spend a day indoors. Color, bake and shrink mermaid and sea creature figurines. Connect their pieces to their stands and make up exciting adventures for them. Shrinky Dinks sheets are made of a special thin, flexible plastic which, when heated in an oven, shrink and harden without altering their color or shape. We precut all the fun shapes in every one of our kits to make them easy to work with.