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Our 500-ct Quality Park #10 double window envelopes (4-1/8 in x 9-1/2 in) fit select QuickBooks invoices & statements; our self sealing envelopes have Redi-Seal press-to-seal flaps & security tints
Redi-Seal mailing envelopes have a unique double flap design that requires no moisture; just raise the lower flap and press for a no-fuss self seal envelope
Double window envelopes show just the sender & receiver addresses; our business envelopes keep private info out of view; top window: 1" x 3-1/2"; bottom: 1-1/8" x 4"; envelope: 4-1/8" x 9-1/2"
Security envelopes shield identification numbers & private data with a special security pattern to scramble the appearance of text; keeps envelope contents safe from prying eyes, even if held to light
Number 10 envelopes measure 4-1/8" x 9-1/2" and have side-seam construction; made of 24 lb white wove paper with professional side seams; stock up on boxes of 500 for all your monthly mailing

Quality Park #10 Double-Window Security Envelopes have self-sealing flaps to save you time and money. The unique REDI-SEAL envelope has a double-flap design that keeps adhesives from sticking prematurely—just raise the bottom flap & press to seal. The double-window format displays the sender & receiver addresses on business statements, invoices & legal documents produced by standard business and accounting software programs. A security pattern lines the interior to keep sensitive contents secure. Stock up on this never-out essential for bulk mailings, payroll and billing cycles!#10 Double-Window. White Wove. 4-1/8 x 9-1/2 inches. 500 Per Box.Mail Faster & Cheaper: Quality Park #10 Double-Window Security Envelopes have self-sealing flaps that save you time and money on mailings.No Waiting, No Wastage: Our ingenious REDI-SEAL envelopes don’t require moisture, seal instantly, and keep adhesives from sticking prematurely—just raise the bottom flap in place, press & seal; you’ll never find ruined pre-sealed envelopes in the box.Trusted Double-Window Format: Double-windows display the sender & receiver addresses for business statements, invoices & legal documents prepared by most business and accounting software programs. Protect Yourself & Customer Data: Shield social security & account numbers with a security tint that makes envelopes difficult to see through; a complex security pattern scrambles the appearance of text as an added measure of safety—an important piece of your liability protections.Eliminate the Yuck Factor: We promise you won't miss licking envelopes or those drippy moistener sponges in a cup! REDI- SEAL envelopes bring mailing into the modern era with a tidier, more hygienic alternative to standard envelopes. Stock-Up Quantities: Boxes with 500 envelopes ensure you're never in short supply.