Quality Park No. 9 Double Window Envelopes with Tamper-Evident Seal

Double Window - #9 - 3 7/8" Width x 8 7/8" Length - 24 lb - Self-sealing - White - 500 / Box. Double-window design positioned from the left to display sender and receiver addresses for invoices and billing statements. Reveal-N-Seal closure with tamper-evident, perforated seal; close without moisture - simply press the flaps together for a permanent seal.