This mold is has been especially designed for hot chocolate bombs. It's diameter is 2 3/8 inches with make is the perfect size. It fits into most mugs but still has room for lots of mini marshmallows. There are five cavities per mold and this mold produces a matte finish which is much easier to hide the seam and much more forgiving to fingerprints. To unmold cover with a cloth and cookie sheet then flip over to gently unmold.