A 20 lb, 100% cotton fiber base, non-solvent transparentized vellum. Transparentizer provides an excellent surface that is compatible with many monochrome and color inkjet printers. Excellent surface for both monochrome inkjet and pen plotting. Fast dry time allows immediate handling of the drawing increasing productivity. Physical properties: 20 lb, 3.2 mil, 56% opaque, 106 white, 92 bright, not acid free, 180 smooth.