Both gears that grind the spices are made of non-corrosive ceramic,NO PLASTIC. With the efficient knob on top, you can easily adjust the grind grade in them from coarse to fine by twisting it. It will be fine when tightening the knob, it will be rough when unscrew. Wood pepper crusher has classic design with visible acrylic window, the clear acrylic shaker body highlights the level of your spice and is easy to refill, simply pull up on the pepper grinder top and refill with your choice of peppercorns, and easily fill the pepper grinder by removing the top. Nice handmade salt and pepper mills-genuine wood + acrylic see through design. Pepper grinder by ceramic burr - Excellent material for reliability and long-time use. Never need worry rusty such as metal grinder. Fully separable designed, use them to grind small and crisp grains, such as chilli, pepper, sea salt and sesame s and so on. It easily locks the freshness and odor of the pepper and keep at afresh for anytime use. Color: wood color, transparent color Material: wood, acrylic Size: about 16.8cm high and about 5.1cm in diameter Package Contents: 1 x pepper millOnly the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.