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Main image of #10 Security Envelopes, 500 Pack, Self Seal Envelopes for Home, School, and Business Mailings, No Window, 4-1/8 x 9-1/2 Inches, Durable 24 lb White Paper

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#10 Security Envelopes, 500 Pack, Self Seal Envelopes for Home, School, and Business Mailings, No Window, 4-1/8 x 9-1/2 Inches, Durable 24 lb White Paper

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VERSATILE #10 BUSINESS ENVELOPES: Standard #10 size (4-1/8 x 9-1/2 inches) is ideal for mailing letter-sized documents folded into thirds, including invoices, statements, business letters, forms, and more. SECURE MAILING ENVELOPES: A blue security tint with safety pattern blocks visibility, helping safeguard confidential information from prying eyes, even when held up to light. SAVE TIME WITH SELF SEAL ENVELOPES: The Release & Seal self-seal closure lets you peel and press for a strong seal, eliminating the need to lick envelopes or use wet sponges. PRESENT A PROFESSIONAL IMAGE: Thick 24 lb white wove paper with side seams creates a crisp, high-quality windowless envelope that reflects well on your business and holds up in transit. BULK VALUE PACK: Stock up on 500 security envelopes that keep offices, small businesses, schools and homes stocked and ready for consistent mailing needs

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VERSATILE #10
BUSINESS ENVELOPES: Standard #10 size (4-1/8 x 9-1/2 inches) is ideal for mailing letter-sized documents folded into thirds, including invoices, statements, business letters, forms, and more.
SECURE MAILING ENVELOPES: A blue security tint with safety pattern blocks visibility, helping safeguard confidential information from prying eyes, even when held up to light. SAVE TIME WITH SELF SEAL ENVELOPES: The Release & Seal self-seal closure lets you peel and press for a strong seal, eliminating the need to lick envelopes or use wet sponges.
PRESENT A PROFESSIONAL IMAGE: Thick 24 lb white wove paper with side seams creates a crisp, high-quality windowless envelope that reflects well on your business and holds up in transit.
BULK VALUE PACK: Stock up on 500 security envelopes that keep offices, small businesses, schools and homes stocked and ready for consistent mailing needs

Additional Information
First Listed on Newegg	August 29, 2026

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Return for refund within: 30 days
Return for replacement within: 30 days
This item is covered by SerendipHome PC Parts Return Policy

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Item#: 9SIC8YYM5N5701