Ravensburger sciencex kristalle zchten edelsteine 18883 german
Crystal growing science kit material crystals recommended minimum age 10 years scientific area minerals series ravensburger sciencex number of experiments 20 equipment science kits instructions utensils protection goggles spatula magnifying glass packaging dimensions 43 3 x 30 1 x 7 4 cm warning not suitable for children under 36 months choking hazard due to small parts