How secure is your mail when it leaves your desk? In a busy ofice or fast-paced business, it's easy to overlook the details. That's until a misplaced document or visible check through a thin envelope creates unnecessary risk. Maybe you've rushed to seal dozens of envelopes by hand, only to end up with messy laps or worse, ones that don't stick. Or you've run out mid-project, scrambling for a quick ix that doesn't quite measure up. Whether you're sending payroll, client letters, or invoices, your mail deserves the same level of care as the contents inside. That's where these #10 Security Envelopes come in. These envelopes are designed to handle the demands of high-volume, high-stakes mailing. Each one is made from sturdy 24lb white paper, giving it the strength to protect your documents from tearing, wrinkling, or showing through—ideal for mailing checks, contracts, statements, and personal information. The interior is lined with a dense security tint that keeps contents conidential, while the windowless front ensures complete control over what's visible on the outside. With a secure self-seal closure, there's no licking, no extra adhesive, and no wasted time—just peel, press, and move on to your next task. Sized to perfectly it trifolded 8.5" x 11" sheets, they're a staple for everyday ofice needs, mailrooms, billing departments, and home businesses alike. Whether you're sending a handful of letters or managing a weekly mailing cycle, these envelopes offer the reliability, quality, and convenience your worklow depends on. Here's more to love about these #10 envelopes: - Thick and durable - Size: 4 1/8" x 9 1/2" - Bulk pack of 500 pieces Don't just send mail—send it right, every single time. Add these #10 Security Envelopes to your cart NOW!