Mass market paperback in the US is 6.7x4.1 inches, that's 170mmx104mm.
'A' format is 178mmx110mm, just a little bigger.
'B' format is 198mmx129mm
Trade paperback is the size of the book block of a hardcover, 9.1 by 6.1 inches in the US (231mmx156mm)
But there is a lot of variation between publishers.
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