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Scientific Explorer Ball Blast Bouncers lets you mix magic powders inside molds to make rainbow-colored bouncy balls. Soak in water to set; takes under 10 minutes. Includes enough to make six bouncy balls. Create stripes, solids, and swirls and when they re ready, play with them! Molds include 2 in. ball, 1.5 in. square, and 1.5 in. bubble. The kit includes 3 ball molds, 9 packets of ball powder (0.4 oz. polyvinyl alcohol, glycerin, butylated hydroxytoluene) and easy instructions. Recommended for children 6 years of age and older.