Modern Innovations Grey Marble Mortar and Pestle Natural Stone Grinder for Spices, Seasonings, Pastes, Pestos and Guacamole is made of natural marble stone that is nicely polished on the exterior for an exquisite shine. The interior of the marble mortar is left unpolished for an ideal grinding process given the roughness of the inner surface (the texture of the marble bowl’s interior). The marble bowl measures 2.5” high with a 4.5” diameter. The pestle measures 5.5” long. The bowl can hold up to 6 ounces. Each marble and pestle is uniquely designed for a special touch of elegance.