GROW CRYSTAL COVERED TREES ? Watch in wonder as crystals grow from the branches of the included evergreen and cherry trees like magic; you?ll see the first crystals in minutes and trees will be fully covered in as little as 6 hours making a fantastic crystal display YOU CHOOSE THE COLORS - Color each tree any way you?d like with the 5 watercolor pens in the kit and grow crystals in the colors you?ve chosen REAL SPECIMEN INSIDE ? This crystal growing activity also comes with a genuine geode specimen as well as a full-color learning guide packed with fascinating facts about crystals COMPLETE ACTIVITY SET ? Because the crystals absorb the ink from the markers and grow in the colors drawn, this kit combines the science of a crystal growing lab with the creativity of an art project, making this a well-rounded activity for girls and boys National Geographic Toys makes the highest quality hands-on science toys, and all products are backed by exceptional service