newton product are quality test approved only. natural rock stone Material : Pure Stone, When the product is dry it is nearly grey but when it’s wet it becomes black. These properties is only found in natural rocks not in artificial concrete. Our material is hard enough to crush the substance rather than be worn away by it. It’s not brittle like concrete, so our product does not break during the pounding and grinding. It’s also cohesive, so that small bits of the mortar or pestle do not mix in with the ingredients.
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