Quality Park® #9 Double Window Envelopes display both sender and receiver addresses for mailing statements and invoices. These security envelopes have a reflex blue pattern that protects sensitive client information because it obscures the details of the contents, even when held up to light.

• Double window envelopes display sender and receiver addresses for invoices and billing statements; #9 envelopes measure 3-7/8" x 8-7/8"
• Protect sensitive client information with a reflex blue pattern that obscures the details of the contents, even when envelopes are held up to light
• Window measurements: top window: 3-1/16" x 15/16", 15/16" from left; 2-1/2" from bottom; bottom window: 4" x 1 1/8", 1" from left; 13/16" from bottom
• Just add moisture to the adhesive strip along the envelope flap and seal closed
• no peel off strip to dispose of
• These 24 lb white #9 commercial envelopes with side seams are great for bulk mailings
• available in stock-up friendly boxes of 500
• Boxes of 500 let you plan ahead for everyday office use and bulk mailings