Students used "Shrink film" to create "Shrinky Dinks". They could make a magnet or a key chain/backpack tag. They draw on the film with sharpies and then an adult uses a heat gun to shrink the film. The film compresses and hardens to a solid state. They can also be hardened in an oven. The pieces cut were approximately 4"x 5 1/2" and after shrinking are 1 1/2" x 2".