Mull is an open weave, stiff, starch-sized cloth, crucial in the construction and strength of a book. It is sometimes known as 'Tarlatan', 'Crash' or 'Super'.
Use this premium quality cloth for helping to adhere (with glue) the bookblock to the case of the binding (the front and rear covers).
Sold in 455 x 500 mm (19 3/4 x 20 inches) sheets which is enough to make/repair many books.
Mull is sent flat and folded.
*'Signatures' are a group of papers, usually folded, which make up a collection of pages. Most books are made up of multiple signatures which are sewn and glued together.