Solid granite construction; Polished exterior with a coarse interior for improved grinding The toughness of granite is due to the slow crystallization of magma below Earth's surface, making it amongst the hardest of rocks. This makes our pestle and mortar very durable and suitable for grinding both hard and soft ingredients Ideal for grinding the freshest of herbs, seeds, spices, and other condiments to create the most fragrant and delicious sauce Granite mortar and pestle allows fine grinding of spices, herbs, and other ingredients; 1.5 cups of generous capacity allows processing a large quantity all at once Made of Food-safe material, no BPA, no lead, no mercury or other harmful elements. Elegant and durable. Does not require much maintenance. Simply rinse with warm water and keep it air dry, do not use soap