Wholesale OPP Bag Transparent Self-Adhesive Bag Clothes Packaging Plastic Bag Mask Packing Bag Self-Sealing PP Bag
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Warm tips
1MM = 100 Silk
double layer 5 wire = single layer 2.5 wire
double Layer 7 silk = single layer 3.5 Silk
double Layer 9 wire = single layer 4.5 wire
(Plastic film is not absolutely uniform thickness under microscope, so there is 0.1-0.5 silk error in single layer thickness)