Letter (paper size) "official" "Government Letter" size, , was used in government, while paper was standard in most other offices. In the U.S., paper density is usually measured in "pounds per ream" (of 500 sheets). Typical Letter paper has a basis weight of paper of – the weight of 500 sheets (a ream) of paper at and at 50% humidity. One ream of 20-pound Letter-sized paper weighs , and a single Letter-sized sheet of 20-pound paper weighs , which is equivalent to 75.19 g/m. Some metric information is typically included on American ream packaging. For example, 20-pound paper is also labeled as 75
Perforated paper the paper is of a heavy weight, it does not require a hoop or frame when stitching. Perforated paper is manufactured in a number of different colours and is typically sold as 14-count A4 size sheets. The "count" refers to the fact that there are 14 holes/perforations per linear inch. This material, known as "Perforated card-board" at the time, first became available in the 1820s as plain sheets used for the creation of bookmarks and small mottoes and sayings, often taken from the Bible. By the 1870s the Victorian craze for this inexpensive and versatile craft material was at its