Quality Park #10 Double-Window Self-Seal Security Envelopes, For Business Statements, Invoices, 4-1/8" x 9-1/2", White, 24-lb, 500 Per Box (QUA24559) SAVE WITH SELF-STICK: Quality Park #10 double-window security envelopes have a fold-away, self-sealing flap that saves you time &amp; money HASTE, NOT WASTE: REDI-SEAL envelopes dont require moisture, seal instantly &amp; won't close and stick before you're readythat means you won't find ruined samples in the box FORMATTED FOR BUSINESS: Double-windows display the sender &amp; receiver addresses; fits invoices &amp; statements from QuickBooks and other standard business software; laser and inkjet printer compatible ENHANCED SECURITY: Offer the protection clients deserve &amp; protect yourself from liability; a security tint makes envelopes hard to see through; a security pattern scrambles the appearance of text AN EXCELLENT VALUE: Get 500 white wove 4-1/8 inch x 9-1/2 inch #10 envelopes per box at a stock-up price