Amazon Basics #10 Security-Tinted Self-Seal Business Letter Envelopes, Peel & Seal Closure – 500-Pack, Whitems Brand New in Box Includes 500 – 10 envelopes made of 24-pound white woven paper; smooth surface works well for direct printing Interior security tint for privacy; securely send checks, invoices, or other confidential documents Peel-and-seal closure; no moisture needed