Grow Your Own Crystals At Home With This 4M Crystal Growing Kit. Includes Three Colored Crystal Seeding Mixtures, Producing A Fully Grown Crystal Measuring 4 Cm X 5 Cm, With Many Different Color Possibilities. Award Winning Toy - Selected By University Of Cambridge Science Festival. Recommended For Ages 10 Years And Up. Learning Skill: Creative Thinking Measurements: 3.75 Length/Inches, 3.63 Width/Inches Base Material: 100% Plastic Care: Wipe Clean Country of Origin: Imported