What causes the 'fine dents and scratches from the manufacturing process' mentioned in the product descriptions of accessories?

Manufacturing scratches refer to natural marks left on the surface during the manufacturing stages of pressing and folding metal to give it shape. VILLA RECORDS has common surface condition standards established for several of its accessories.

For VINTAGE PILL CASE_ROUND, fine dents or scratches are not grounds for defects because they are phenomena that appear identically across the product due to the manufacturing process^[1]. VINTAGE TIN CASE and PORTABLE ASHTRAY also treat fine dents or scratches resulting from the manufacturing process and material characteristics as normal^[2][3]. VINTAGE PILL CASE_SQUARE also provides guidance on fine marks that may occur depending on the process and material characteristics^[4].

Generally, when making cases out of thin metal sheets like tin, they undergo press forming where shapes are stamped out under strong pressure. During the process of coming into contact with mold machinery or interlocking and bending corners, fine scratches or shallow indentation marks are easily left on the surface. On metal surfaces that do not have thick layers of paint or coating, the friction from the processing easily shows on the exterior.

hmmm, unlike smooth plastic containers without a single scratch, accessories made by pressing metal sheets naturally retain the traces of the making process in their craftsmanship.