10 - 8 5/8" x 18 1/2" Brodart Book Covers - Center-Loading, Adjustable, Clear Mylar These high quality book jacket covers are Center-Loading for Dust Jackets up to 8-5/8" tall. The covers are 1.5 mil in thickness. Lo-Luster covers cut down on glare from overhead lights, protect against harmful UV rays and hide jacket imperfections. Closed edges are permanently bonded. Paper backing for added protection.