Hardcovers are frequently protected by artistic dust jackets, but a "jacketless" alternative has increased in popularity: these "paper-over-board" or "jacketless" hardcover bindings forgo the dust jacket in favor of printing the cover design directly onto the board binding.For very popular books these sales cycles may be extended, and followed by a mass market paperback edition typeset in a more compact size and printed on thinner, less hardy paper.This is intended to, in part, prolong the life of the immediate buying boom that occurs for some best sellers: After the attention to the book has subsided, a lower-cost version in the paperback, is released to sell further copies.Hardcovers usually consist of a page block, two boards, and a cloth or heavy paper covering.[1] A paper wrapper, or dust jacket, is usually put over the binding, folding over each horizontal end of the boards.