Brand NEW Envelopes Self Seal Security Envelopes #10 Standard Size Business Envelopes 4-1/8 x 9-1/2 Inch 500 count No Window Blank White Envelopes Quality 24 lb paper Maximum Strength Self Seal: Unlike other envelopes that need extra tape or glue, Spark Ink spares no expense on thick, peel and seal adhesive that really sticks. Heavyweight Security Envelopes: Spark Ink specifically designed these envelopes with a dark navy, heavy coverage security tint to provide guaranteed privacy for your legal or business mail. Crafted with thick, 24lb paper that ensures upmost privacy. Never Get Fooled Again: These Envelopes Tear When Opened! Exclusive tamper evident slits provide increased security to prevent careful opening and resealing. Perfect for Check Printing: Windowless blank design allows for easy address printing or labels for mass mailing or to simply keep a bulk supply on hand for your home office. Environmentally Friendly: Rest easy when you send a letter. These envelopes are manufactured from well managed forests and are fully recyclable. See pictures for more item details. Trusted Seller - Fast Ship!