I examined these grinding wheels under a magnifying glass. Although they come in 6 different colors and are marked with different grind levels, the bristles are identical. They are neither thin nor thick. They are not softer or rougher. They are neither closer nor further away. Aside from the color, they are exactly the same. If you want 60 bristle discs, this set will do. If you want 10 of the 6 different levels of wear, look elsewhere. Oh, and 1 of the 4 rods had a stripped screw/thread and was unusable.
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