It has to do with the 40mm being used for the long se-tenant issues and it being one of the smaller heights in the 265mm length mount. I just found it kind of humorous that the packaging is 2.5 times the size for the mount compared to the 39 and 41.
I've written Amos Press several times and have suggested many ideas including more standardized packaging like size 40 be made the same length and amount as size 41 and make like size 78 and 97.
I get the same answer every time: We'll take it under consideration. The only change I've seen is they are now placing 55mm strips in a wider package which was NOT a good idea!
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