The Muller is a beautifully made object of solid glass with a perfectly grounded flat base. Mullers are used by artists needing to grind their own pigments. The bulbous handle is specially formed to provide a comfortable grip. The bottom of the glass Muller is flat and sandblasted to provide an excellent grinding surface. Use the Muller on a thick sheet of glass to grind and disperse pigments and other materials into paint.