Bath Bomb Mold - Extra Large Size - 2 Set 4 Pieces - Make 8 cm/3.15 inch Diameter Incredible Ball by ROUNDSQUARE Must Have for DIY Bath Bomb Mold: Perfect for shaping the homemade bath bombs. Make professional looking for them. Easy to use. Dishwasher safe. Perfect Size: Diameter 8cm/3.15 inch, makes 4.6 to 6.1 oz bath bombs depending on the ingredients used. Durable Material: Sturdy aluminum metal made, not like the plastic one break easily. Sturdy aluminum metal made, not like the plastic one break easily. Safe with Citric Acid: The mold won't have a chemical reaction with citric acid as they are made of high quality aluminum. Please wash the mold with baking soda or washing up liquid before using it. Package Content: Set of 2 included 4 half spheres. You can share fun with your friends or children!