Dr.Luck 3 Sizes 3PCS Aluminum Homemade Bath Bombs for Crafting Your Own Fizzles.Heavy Duty Metal, Dent and Rust Proof These molds do not snap together, both pieces are exactly the same. Set of 3 different sizes bath bomb molds (6 pieces) Finished bath bombs weight: large 4+ ounces, medium 2+ ounces, small 1+ ounces. Large diameter is 6.5cm/2.5in, Medium diameter is 5.5cm/2in, Small diameter is 4.5cm/1.75in. Durable, high quality, won&#39;t break like plastic molds do. Re-use over and over again.