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Scientific Explorer Light-Tastic Mega Ball is a science kit sure to result in excitement. By mixing the chemicals, packing them in a mold around a light, you can create a 2.5 in. mega ball that flashes when bounced! The set includes 7 packets of ball powder (2.45 oz.), 1 ball mold, 1 light up ball and easy instructions. Ball powder contains polyvinyl alcohol, glycerin and butylated hydroxytoluene. Recommended for children 6 years of age and older.