Adams® 2-Up W-2 Gummed Seal Double-Window Security Tint Envelopes are designed specifically to fit continuous feed W-2 forms produced with pin-fed dot matrix printers, making them ideal for bulk mailing. Crafted from 24 lb white wove paper, each envelope features a security tinted pattern and precisely aligned windows to ensure that sensitive, confidential information is kept private. Gummed flaps seal securely with moisture. "Important Tax Return Document Enclosed" is printed on the front face. Seam Type: Side; Flap Type: Commercial; Security Tinted: Yes; Opening: Open Side.