It fits into the Merkur stands made to hang the Futur/Vision razors and brushes. This is the same size bowl that comes with the set. Use it alone with your favorite brush or combine it with a stand and make up a complete matching set. Please check out the matching Futur/Vision Razor, Silver Tip Shave Brush and Stand available individually or as a set by visiting IrishBarber shop front. Use either 2.5 inch or 3 inch solid cake soaps. For a custom fit just melt any of the glycerin soaps in a paper container in the microwave for a few seconds and pour into your mug and allow to solidify.