20 Yards Brodart Fold-On Book Jacket Covers COMBO PACK - TWO 10 YARD ROLLS (10 & 12 inch) -- Center-Loading, Clear Mylar, Adjustable COMBO PACK: includes 1 (one) 10 yard 10" roll AND 1 (one) 10 yard 12" roll Center-Loading Fold-On Book Jacket Covers for easy application Fits dust jackets up to 10" & 12" tall Clear, Lo-Luster covers Polyester mylar is 1.5 mil in thickness