• Multi-Purpose Use: Fits a variety of contents, including checks, letters, invoices, and more.
• #10 Security Envelopes: Lined with security print to keep sensitive information private.
• Peel & Seal Closure: No moisture or tape needed—just peel and press for a secure hold.
• Windowless Design: Clean front panel allows easy addressing by hand, label, or printer.
• Durable Paper Stock: Made from sturdy 20lb white paper for reliable everyday use.

These #10 security envelopes are a reliable and versatile choice for all your mailing needs. Measuring 4 1/8″ x 9 1/2″, they are perfect for sending invoices, checks, letters, gift cards, and more. Crafted from durable 20lb white paper, these envelopes feature a windowless design ideal for printing, labeling, or hand-addressing—making them perfect for bulk business mailings. The interior security tint protects sensitive information from view, ensuring privacy during transit. A convenient self-seal closure eliminates the need for licking or tape—just peel and press for a strong, secure seal every time.