Units of paper quantity the 500-sheet ream has become the de facto international standard. A paper bundle is a quantity of sheets of paper, currently standardized as 1,000 sheets. A bundle consists of 2 reams or 40 quires. As an old UK and US measure, it was previously equal to 960 sheets. When referring to chipboard, there are two standards in the US. In general, a package of approximately 50 pounds of chipboard is called a bundle. Thus, a bundle of 22 point chipboard (0.022" thick) 24" × 38", with each sheet weighing 0.556 pounds, contains 90 sheets. However, chipboard sold in size 11"
Codex where the membrane was folded so that it turned out an eight-leaf quire, with single leaves in the third and sixth positions. The next stage was tacking the quire. Tacking is when the scribe would hold together the leaves in quire with thread. Once threaded together, the scribe would then sew a line of parchment up the "spine" of the manuscript, as to protect the tacking. Codex A codex () (from the Latin "caudex" for "trunk of a tree" or "block of wood", "book"), plural "codices" (), is a book constructed of a number of sheets of paper, vellum, papyrus,