Item Number TF44441 (Replacement Item Numbers 4356, DW387) Ensure immediate attention. Double-window envelopes come preprinted with the statement Important Tax Return Document Enclosed 24 pound paper stock 9 x 5 5/8 W-2 4-Up Horizontal Laser Envelope. Gum seal flap Top Window: 3/4 x 3 3/8 - 3/8 from left, 4 1/4 from bottom Bottom Window: 7/8 x 3 3/8 - 3/8 from left, 5/8 from bottom Quantity discounts built into pricing