· DOUBLE WINDOW SECURITY ENVELOPES; tired of cheap paper envelopes that can be easily seen through? Our Double Window Security Envelopes are ultra-secure and perfect for mailing invoices, statements, and standard business & legal documents, with secure moisture-activated gummed seal and tinted security patterns· TINTED SECURITY PATTERN; perfect for mailing invoices, statements, standard business & legal documents and sensitive correspondence, our #10 Envelopes are printed with a secure tinted pattern, easily obscuring numbers and data for premium, added security compared to other cheap envelopes· DUAL WINDOW DESIGN; easily read dual windows for everyday business mailings to easily display postal addresses. Each envelope contains two front windows, a 1" X 3-1/2" top window positioned 1/2" from the left and 2-1/2" from the bottom and the bottom 1-1/8 X 4" window is 1/2" from the left and 3/4" from the bottom· LONG LASTING SUPPLY; perfect for everyday business use, our envelopes are provided as a long lasting, 100 envelope supply, measuring 4-1/8 x 9-1/2, ideal for mass mailing and all business needs!