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What is the correct size for a post card, letter?

The following is the size requirements for a post card and a letter:


Size Post Card Letter
Minimum Size  3 1/2" H x 5" L 3 1/2" H x 5" L
Maximum Size 4 1/4" H x 6" L 6 1/8" H x 11 1/2" L
Minimum Thickness .007 inch .007 inch
Maximum Thickness .016 inch 1/4"
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