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 - 500 / Box - White

Reveal-n-Seal Envelopes with double windows feature a unique adhesive that provides strong, moisture-free secure seal and an extended shelf life. You'll have no removable strip to throw away. Inside tint and perforations along flap reveal any tampering. No. 9 envelopes are compatible with most standard 8-1/2" x 11" invoices and statements. 24 lb.