Gravity Operated. Simply flip or invert to activate for effortless one-handed dispensing of your seasonings. * Durable eco-friendly ceramic mechanism easily grinds peppercorns, salt, and spices. * Seasons accurately with adjustable ceramic grinding mechanism that adjusts from fine to coarse. * Features a top-mounted grind adjustor that never leaves a trail or mess, and an ultra soft textured non-slip grip. * See-through container makes monitoring pepper level easy and reveals the grinding action. Satisfaction Guaranteed.