Made of acrylic (PMMA). Durable ceramic grinding mechanism, the precise placement of the grinding wheel leaves a gap between the teeth and reduces abrasion. Pepper mill fitted with unique grinding adjustment mechanism at the bottom of the mill, adjustable in 4 steps from fine to coarse. The grinding mechanism of the salt mill is not adjustable which gives consistent results. The cap is easy to remove for refilling, its screw tension does not influence the grinding mechanism of the pepper mill.