Freshly Grind Spices The stainless steel lid can keep your spices away from moisture and dust. Freshly ground spices can solve the problem of weakening the fragrance of spices due to long storage time. The professional grinder strips spices down by their individual layers as it grinds, releasing maximum flavor. Premium Stainless Steel Grinder The salt and pepper shakers are made of the highest grade non-corrosive stainless steel and BPA Free glass bottle. The sealing lid can prevent moisture and water penetration, keeping your spices remain completely fresh. Two Adjustable Particle Size The grinders have high hardness ceramic grinding core, which can grinding out more delicate spices and quickly produce powder. It offers fine and coarse granules to meet your different spice needs. You only need to turn the knob to adjust the thickness of the ground powder.