These high quality book jacket covers are Center-Loading for Dust Jackets up to 12" tall. The covers are 1.5 mil in thickness. Lo-Luster covers cut down on glare from overhead lights and hide jacket imperfections. Closed edges are permanently bonded. Paper backing for added protection. By purchasing Brodart on a roll you are free to customize the width of your cover to fit the exact width of the book. This is important when standard width covers do not adequately protect the inside dust jacket flaps on oblong or extra wide books. Please email me if you need any assistance in figuring how much Brodart you may need. Overall height of these book cover rolls is 12" and will work on any dust jacket up to 12" tall.