It comes in rolls of 18" and 24"
TAMKO Thru-Wall is a self-adhering sheet membrane consisting of a self-adhering rubberized asphalt and an 8-mil polymer film as the top surface. TAMKO 40 Mil Flashing features treated release film for installation and handling. Thru-Wall is used with concrete, masonry, gypsum, felt-faced and foil-faced polyisocyanurate foam insulation or wood wall construction.
https://www.tamko.com/docs/default-source/data-sheets/TAMKO-tw-thru-wall-flashing-data-sheet.pdf?sfvrsn=ef0a56a0_9