Quality Park No. 9 Double Window Security Tint Envelopes with Self-Seal Closure

Security - #9 - 3 7/8" Width x 8 7/8" Length - 24 lb - Adhesive - White - 250 / Box. Double-flap design with Redi-Seal closure keeps the gum from sticking before use - simply raise the lower flap and press to seal without adding moisture. Top and bottom windows positioned to the left to accommodate addressed mailing.