Keep your mail safe, secure, and professional with #6-3/4 Peel & Seal Security Envelopes. Each envelope measures 3 5/8" x 6 1/2", crafted from durable 20lb white paper, and features an easy self-seal closure—no need for licking or moistening. The security-printed interior protects sensitive contents like checks, invoices, or personal letters from being seen through the envelope. With a windowless design, these envelopes are ideal for customized labeling or printing. Whether for business correspondence, financial documents, or everyday mailings, this value pack of 320 envelopes (4 packs of 80) provides long-lasting quality and convenience for all your mailing needs.