Oce Permanent Image 9800 Vellum. Only the highest quality base stocks are used to provide durability. Proprietary coatings are applied to create a surface that accepts toner uniformly. The result is crisp, high contrast, quality prints. This Vellum is best suited for use as a second original when making diazo reprints.PROPERTIES: White, Non-Erasable, Opacity: 63% , Weight: 20 lb.