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Grade

Grade A:No discolor allowed, No splits allowed, no holes allowed.
Grade B:Slight discolor allowed, slight splits allowed, no holes allowed.
Grade C:Medium dislolor allowed, split allowed, no holes allowed.
Grade D:Discolor allowed, splits allowed, within 2 holes diametre below 1.5 cm allowed.
inspection
1.Thickness
2.width and Length
3.Moisture