Pinit First Day Cover Sleeves 4-1/4 x 9-5/8". 2.0 mil Polypropylene. Fits U.S. Cover #10 envelope. Long-term Storage. SKU: SPPFDCUS10 (0)No Reviews yet Add to Shopping Cart Details Guardhouse Brand First Day Cover Sleeves 4-1/4 x 9-5/8" 2.0 mil Polypropylene Fits U.S. cover - # 10 envelope. Open on one short end. Long-term S... Details Back DetailsGuardhouse Brand First Day Cover Sleeves 4-1/4 x 9-5/8" 2.0 mil PolypropyleneFits U.S. cover - # 10 envelope. Open on one short end.Long-term Storage. Reviews 0 Back Ratings & ReviewsNo reviews availableBe the first to Write a Review