GROW ONE SPARKLING "AQUAMARINE" CRYSTAL CLUSTER OF UP TO 4" (10 CM) IN DIAMETER! Growing SPACE AGE CRYSTALS ® is easy, fun and educational. Just dissolve the pre-mixed crystal powder in warm water and within just a few hours sparkling crystals of up to 4" (10 cm) in diameter will start to grow, right before your eyes. A fascinating experience for children and adults. Crystals and crystal growing powder are biodegradable . Contents: Crystal growing powder, instructions. USA: Ages 10+ WARNING: This kit contains chemicals which may be harmful if misused. Read cautions on individual containers carefully. Not to be used by children except under adult supervisions. Weight 0.35 lb Dimensions 8" height x 2.75" width x 1.5" depth