These archival quality sleeves are the perfect match for your CD Collection. The acid-free, static-free, Biaxially Oriented Polypropylene (BOPP) provides CRYSTAL CLEAR CLARITY, and the premium 2 mil thickness feels nice in your hands, and makes your CDs look great. Specially sized at 6-1/8 inches Width x 5-1/8 inches Height (156mm x 130mm). The perfect fit, with no sloppy overhang at the top. You can't do wrong with this affordable sleeve - perfect protection for your collection.