Grows sparkling crystal cluster up to 4" (10 cm) in diameter! Growing SPACE AGE CRYSTALS ® is easy, fun and educational. Uses patented solutions below 131 °F / 55 ° C (no more hot boiling water needed). Discover the laws of nature which create crystals deep inside the Earth and perform experiments like astronauts, who grow ultra-pure crystals in the weightlessness of space. Just dissolve the pre-mixed crystal powder in warm water and within hours sparkling crystals will start to grow, right before your eyes. Crystals and crystal growing powder are 100% biodegradable . A fascinating experience for children and adults ages 8 and up. Contents: Crystal Growing Powder 100 g. 3.5 oz., stirring rod and fully illustrated instructions. USA: Ages 8+ 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 supervision. Weight 0.35 lb Dimensions 6.25" height x 4.75" wi dth x 2.25" depth