These manila book pockets are reinforced with double thickness at the top and corners to resist strain for longer wear and fewer replacements. They feature a fold-over edge that keeps book cards in place. Meeting all library processing requirements, the cards have the extra wide 3-1/2" low fronts. Book pockets are plain-backed with high backs. Pockets measure 6-1/4"H x 3-1/2"W x 2-1/2"D. Box of 500.