Classic Round Bath Bombs Kid's Gift Set. Scented with the highest quality essential oils and organic fragrance oils, and free of harsh irritants or chemicals. Every bomb is made with the finest therapeutic grade essential oils and contain baking soda, witch hazel, citric acid, and natural mica coloring. Simply drop into the bathtub, and let the water handle the rest. Each set comes with 6 different colored bath bombs, each with its own unique scent. Bath bombs measure approximately 1 1/2” in diameter.