Pinit First Day Cover Sleeves. 3-15/16 x 6-7/8". 2 mil Polypropylene. Fits U.S. cover # 6 envelope.Long-term Storage. SKU: SPPFDCUS6 (0)No Reviews yet Add to Shopping Cart Details Guardhouse Brand First Day Cover Sleeves 3-15/16 x 6-7/8" 2.0 mil Polypropylene Fits U.S. cover - # 6 envelope. Open on one short end. Long-term ... Details Back DetailsGuardhouse Brand First Day Cover Sleeves 3-15/16 x 6-7/8" 2.0 mil PolypropyleneFits U.S. cover - # 6 envelope. Open on one short end.Long-term Storage.**IN STOCK** Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review