500 Number 10 Single Window Envelopes - Thick Gummed Seal - Designed for Secure 


  • Perfect for mailing Invoices, QuickBooks Invoices and checks, billing statements, checks, and other business mail.
  • No need for tape or glue sticks as our strong gummed seal creates a hassle free and safe seal for all your sensitive documents.
  • Provides complete business mail security: your professional business mail will be completely hidden with our dark security tint design
  • Create professional looking mail with the added security of a single window envelope. Your business mail recipient address will show through the single window and you can quickly print your return address or add return address labels