Double Window Security-Tinted Check Envelope, #10, Commercial Flap, Gummed Closure, 4.13 x 9.5, 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.