Large 10" size, designated for grinding pepper by the "P" on the top knob; 6" size, designated for salt by the "S" on its knob. Unique olive wood patterning with ceramic hardware. Olive wood is a hard wood making it very dense and durable for everyday use. Olive wood is non-porous so no germs or odors are retained. All products are made from a single piece of wood- they are seamless & no two pieces are exactly alike.