The mould won’t have a chemical reaction with citric acid as they are made of high quality stainless steel. The more you use the more it would shine with luster. And These are hard material molds which means you can press hard as much as you like to make a firm bath bomb. These won’t break easily like the plastic molds you used to. The molds are durable and everlasting, you can reuse them as long as you would like to. But it’s the most expensive one when compare with others.

This material is the most common one, and most of the mould in the market is Aluminium alloy. Almost similar with stainless steel one, durable and everlasting, you can resue them as long as you would like. But Aluminium alloy is not so easy to scratch as Stainless one, and also, it’s cheaper then stainless steel mold.

The plastic bath bomb mold is the cheaper one, but it’s plastic material, could not be durable and everlasting as stainless or Aluminium alloy mould. And may be broken as used. But it’s Sleek, sturdy design, with an airtight seal along with a pre-punched eyelet that makes hanging and displaying your product simple.