First, there is no requirement for printed materials to have rounded corners, due to both the increased complexity and cost of the process, as well as the resulting waste of material (inefficient use of paper).
Secondly, the QSL card itself does not have a specific size standard to follow; instead, it refers to the standards for postcards and paper sizes. I recommend that our factory expedite the drafting of standardized QSL specifications, as detailed below: common and frequently used QSL dimensions are provided.
YZ/T 0190 – 2023
ISO 216
Or 4x6 inch 4R photo paper
In conclusion, due to variations in size and other factors, it's impossible to achieve a perfectly uniform size.
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