There's no kiln needed with this collection of air-dry clays. Model, shape, build, and create with this pliable clay and shaping tools, then simply set it out to dry. Once it's hard, you can decorate further with paints or markers. The kit contains 24 mixable colours. The Creatibles D.I.Y. Air-Dry Clay Kit is everything a budding sculptor could want. The super soft clay makes hand building your creations easy and fun, especially with the help of 3 sculpting tools to add detail and dimensions. , , With 24 mixable colours to choose from, the possibilities are limited only by your imagination. Once your project is complete, simply leave it out, and it will harden on its own. Then, if you would like to decorate further, you can use paints or markers to finish the piece. The 24 clays come in 6 airtight tubs to keep the clay fresh.