A book's cover consists of three boards - the front, the back and the spine - that protect the contents and provide support to the book. This strong board made by the Davey Company is the choice of binding professionals. Unlike cheaper laminated chipboard, this dense board is very stable and resists warping.Details:White15" x 20" board size4 boards70 Pt.ArchivalSingle plyCorners and edges durable and strong