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Size： 8*4’, 7’*4’, 6’*4’, 7’*3’, 6’*3’, customized
Grade B： Slight discolor, small crack, No hole, No fibre
Thickness： 0.15-1.0mm
Grade A： No discolor, No fibre, No hole, No splits
Grade C： Medium discolor, Slight pin, bean hole, Light fibre
Grade D： Discolor, splits, egg size holes no more than 3
