No. 6 3/4 envelope 3 5/8 " x 6 1/2" 2 mil ultra clear polypropylene No. 6 3/4 envelope 3 5/8 " x 6 1/2" Polypropylene is an inert, archival quality, PVC-Free material Ideal protections against dust and moisture during handling and storage 100 per pack Guardhouse Shield#: 636836681054. Size: 3 15/16 x 6 7/8. Color: Clear. Sold in Packs of 100.