#10 Window Machine Insertable Envelope w/Peel & Seal

Professional #10 window envelopes designed for machine insertion and automated mailing, making them perfect for high-volume business use. Measures 4 1/8" x 9 1/2" and fits standard 8.5" x 11" letters folded into thirds, with a clear window for showing the recipient address—no labels needed. Features a peel-and-seal self-adhesive strip for fast, clean, secure closing. Ideal for invoices, statements, payroll, billing letters, and office mailouts with a polished, efficient look.