· Has The next level of toughness than WA (white alundum), and Together with the WA level of hardness, it has outstanding form retention, so it's a protracted dressing cycle, and generates very little warmth in the course of grinding. As compared to WA, it can be used in fields https://beediadiamond.com/catalog/rubber-points
หัวเจียรยาง - An Overview
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