Double Window Security tinted Check Envelope, #9, Commercial Flap, Gummed Closure, 3.88 X 8.88, White, 500 box Lexmark™ MS321dn making adding and removing pages routers and other devices making adding and removing pages effortless 96 Chemical Active Ingredient(s): alcohol ethoxylates and ethoxylated secondary alcohol Concentrated or Ready To Use: Concentrated Dilution Control Chemical Type: Floor Cleaner Dilution Control System: Diversey RTD Dilution Ratio: 1:256 Quality Park® Double Window Envelopes display both sender and receiver addresses for mailing statements and invoices These security envelopes have a reflex blue pattern that protects sensitive client information because it obscures the details of the contents