sintered diamond strawberry: Last 5-10 times longer than diamond plated burs For dental lab,jewelry,lapidary,gemstone 5 grits Technology:1. Consist of diamonds throughout, sintered diamond burs also specifically manufactured to cut and trim Zirconia, Alumina Oxide and other hard ceramic and jewelries materials, suitable for shaping, carving and polishing all kinds of minerals.2. Last 5 to 10 ...