Wrappers
The wrappers are the outer covers to a pamphlet or similar type of publication. Usually shortened to wraps, they are typically of card or paper material with a heavier bond than the interior pages. Wrappers are more commonly associated with antiquarian titles, although the term could also be used to describe some small press publications. Certainly the term is one that distinguishes a publication from both the hardback (which has boards and, usually, a dust-jacket) and the paperback.