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IMPRESSIVE CRYSTAL - Grow a real giant crystal up to 10cm in diameter, visible week after week, for a fascinating and memorable experience. 2 STEP PROTOCOL - Start by growing small crystals in 48 hours in the supplied tumbler, then use them as a germ to grow your giant crystal in the bucket for several weeks. ALL INCLUDED, READY TO START - The kit contains pre-measured crystal powders (76g and 370g), a 250ml tumbler, a 2 litre bucket and a clear and easy to follow colour illustrated instructions. IDEAL GIFT FOR 8 YEARS OLD - Perfect for arousing the scientific curiosity of children and teenagers, this kit combines patience, observation and pride in the result — ideal for Christmas or birthday. REAL EDUCATIONAL EXPERIENCE – By observing the growth of the crystal day after day, the child discovers concretely the phenomena of crystallization and chemistry of solutions, in a fun and autonomous way.