What is the recommended thickness for a letter governing the minimum and maximum sizes?

The recommended thickness for a letter governing the minimum and maximum sizes is 0.25 inches. This specific thickness provides a balance between ensuring the letter is substantial enough to convey information clearly while still being manageable in terms of handling and production. A thickness of 0.25 inches is typically used to maintain structural integrity, especially for important documents that may need to withstand multiple touches or movements.

Thinner options may not provide the necessary durability, leading to potential damage or illegibility over time. In contrast, thicker options might make the letter unwieldy and more prone to cost increases in production, shipping, or handling. Therefore, the choice of 0.25 inches reflects industry standards for clarity and practicality in the design of letters related to size specifications.