Tyoungg Assorted Shapes and Sizes Plastic Bath Bomb Mold 6 Sets of Heart Shape 6 Sets of Sphere Round Ball Package includes 12 sets of bath bomb molds. 6 sphere molds plus 6 heart shape molds. Different shapes meet your different needs. Both round molds and heart shape molds get two sizes. Round bath bomb molds: 6 cm diameter and 8 cm diameter. Heart shape molds: 5.5 cm and 7 cm width. Made of high quality plastic.