Double Window Security tinted Check Envelope, #10, Commercial Flap, Gummed Closure, 4.13 X 9.5, White, 500 box 42" com Environmental Design 1: High # of Labels Per Pack:750 com Environmental Design 1: High yield ink and toner Family Model #: TR6432B001DS ST6432B001DS Ink or Toner Cartridge Type: Remanufactured Ink or Toner Color: Black Ink or Toner Pack Size: 1 Pack MICR Toner: No Number of Black Cartridges: 1 Number of Color Cartridges: 0 Pack Qty: 1 Page Yield Per Cartridge (Up to): 500 Post Consumer Recycled Content: 99% Recycled: Yes Refill: No Remanufactured: Yes Series or Collection: PGI 250 Supply Type: Ink Total Recycled Content: 99% True Color: Black Warranty Information: 1 Year Yield Type 1: High Yield Yield Type 1 Color: Black Yield per Cartridge (Black): 500 Can be used as front or back covers These security envelopes have a reflex blue pattern that protects sensitive client information because it obscures the details of the contents even when held up to light