Double Window Security-Tinted Check Envelope, #9, Commercial Flap, Gummed Closure, 3.88 x 8.88, White, 500/Box

• Double window envelopes display sender and receiver addresses for invoices and billing statements.
• Protect sensitive client information with a reflex blue pattern that obscures the details of the contents, even when envelopes are held up to light.
• Just add moisture to the adhesive strip along the envelope flap and seal closed; no peel off strip to dispose of.