FUN AND LEARNING COMBINED: You can help kids learn about primary colors with this Model Magic collection, and they can use the white modeling material to lighten dark colors into pastels. USE ONCE OR AS OFTEN AS YOU WANT: The modeling material air-dries in about 24 hours or you can store it an airtight, resealable container for another day of creative fun. SQUISHY CLEAN FUN: Kids love to squish and squeeze the soft, spongy material through their fingers. Thanks to the crumble-free formula, parents will love the easy clean up. PACKAGE CONTENTS: 6 x 0.5 oz. packs of modeling material (2 white, 1 red, 1 yellow, 1 blue, 1 black).