Features: Material: Aluminum alloyColor: SilverSizeSmall:1.8inch(diameter)Medium:2.2inch(diameter) Large :2.6inch(diameter)Package Included : -6 Set x Small Bath Bomb Mold -6 Set x Medium Bath Bomb Mold -6 Set x Large Bath Bomb MoldIngredients of making bath bomb1/2 cup citric acid 1/2 cup epsom salts 1 cup baking soda 1 tsp. water 2 tsp. essential oil or fragrance oil (avoid minty oils) 3 tsp. olive oil or similar vegetable oil a few drops food coloring (any color)How to use the Bath Bomb Mold Step 1: Fill each half of your dome molds with the ingredients mixtures until it's just overflowing a little. Step 2: Press the two sides together and use a lot of pressure to compact the mixture firmly into the molds, to prevent cracking. Step 3: Whisk away the excess mixtures around the molds. Step 4: Use a metal spoon to tap slightly around the molds. Step 5: Gently remove one side of the mold, then gently invert the bath bomb so the uncovered side is facing down, then gently remove the other half of the mold from the top.NOTE: DO NOT hit the molds with metal spoon. Not suitable for use in a dishwasher. Bath Bomb should be removed once it's formed into a round ball and and should not be left in the mold for curing.