Concave: Emery has less moisture in. There are a lot of moisture in the air must be brought to a humid environment sanding.
Convex: Emery has a lot of moisture. Emery has less moisture in the air must be brought to a dry environment.
Concave: Emery has less moisture in. There are a lot of moisture in the air must be brought to a humid environment sanding.
Convex: Emery has a lot of moisture. Emery has less moisture in the air must be brought to a dry environment.
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