A pack of 6 archival-quality polypropylene sleeves with acid-free backing boards for use in the Universal Playbill Binder only. These sleeves are too large for use in the Ultimate Playbill Binder, and will not attach to the Basic Playbill Binder, which is not a three-ring binder like the Universal and Ultimate Binder. The Basic Playbill Binders uses a different mechanism to hold the Playbills in place. The Universal Playbill Binder comes with 18 archival quality polypropylene sleeves with acid-free backing boards. Because so many of our customers have very large collections and wish to fit as many Playbills as possible into the Universal Binders, we offer this extra pack of six sleeves to bring the total number of Playbills held in the Universal Binder to 24 - the absolute limit we recommend before the stress of overstuffing the binder may damage the spine of the binder and your Playbills over time. Fits The Universal Sleeves hold Playbills from all eras measuring up to 6 3/4" by 9 1/4".