These folders are made from .012 MicroChamber paper or .010 Lig-Free I for paper documents, or from our .010 Non-Buffered stock for photographic materials. They have closed bottoms and sides with accordion pleats to allow expansion to 1-1/2″. The 6 inch front flap has 3 score lines to accommodate this expansion which offers extra protection for unbound manuscripts, documents, or ephemera of various sizes. Letter size folders measure 10-1/4 x 12-1/4 and legal size folders measure 10-1/4 x 14-3/4. Sold in packages of 5 folders.