Desktop Publishing Supplies Black Envelopes hit the mark in thickness, quality, and affordability. A deep black, smooth finish makes your mailpiece stand out from the rest. Feels great, looks great, and works great with markers, pens, and even Inkjet or Laser Printers (must be able to print in white ink). Made from a heavyweight 28lb / 70lb Text paper stock for a durability. Features a standard Booklet Style Square Flap with moisture activated glue for sealing. Desktop Publishing Supplies - Reliable. Affordable. Consistent. Established 1995.