1. : this grinder set is made of natural oak, stainless steel, aluminum and ceramic rotor. It doesn't matter which one you use for salt or pepper, BOTH GRINDERS are INTERCHANGEABLE.2.ADJUSTABLE GRINDING SETTING: ceramic grinding mechanism allows you to achieve spice final crush, mill and grind, ADJUST the coarseness from coarse to fine as your preference by TWISTING SLIGHTLY the nut at the top of the grinder from loose to tight .3.: Screw wooden top cap to keep away from moisture, protect your spice in grinder fresh for long time.4.EASY RECOGNIZATION: Oak wood grinders can store salt, pepper and other spice,two different colors help you to differ different spice for easy recognition.5.EASY to CLEAN & CAPACITY: this salt and pepper grinder is equipped with a cleaning brush for easy cleaning and a wood stand for easy storage.