This kit lets children create five colourful keyrings representing Mexican wrestler masks from shrink plastic! To do this, they place the design under the corresponding transparent plastic outline and reproduce the template with the coloured pencils. Once they go into the oven, the magic happens: the figures shrink in just a few seconds, and the plastic becomes hard and thick. All you have to do is hang the mask creations on the coloured rings to create beautiful key rings. This kit lets children create five colourful keyrings representing Mexican wrestler masks from shrink plastic! To do this, they place the design under the corresponding transparent plastic outline and reproduce the template with the coloured pencils. Once they go into the oven, the magic happens: the figures shrink in just a few seconds, and the plastic becomes hard and thick. All you have to do is hang the mask creations on the coloured rings to create beautiful key rings.