12Set 3Size 24Pcs: Large diameter is 2.56 inch - 8 pieces, Medium diameter is 2.17 inch - 8 pieces, Small diameter is 1.77 inch - 8 pieces. Come with three sizes, give you more optionsMultifonction: Not only of DIY Bath Bombs, but also for mold food. Economical: Make the bath bombs by yourself can save your money and enjoy the weekendPremium Material: Made from durable, sturdy, food grade aluminum metalPopular Gifts for your partners, friends or family membersMaterial: Aluminum alloy Color: Silver Internal Diameter: S: 4.5cm / 1.77 inch M: 5.5cm / 2.17 inch L: 6.5cm / 2.56 inchIngredients of making bath bomb 1/2 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 useStep 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 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. Package Contents:4 set x 1.77 inch Bath Bomb Mold 4 set x 2.17 inch Bath Bomb Mold 4 set x 2.56 inch Bath Bomb Mold NOTE:DO NOT hit the molds with metal spoon. Not suitable for use in a dishwasher.Only the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.