This 16-pound vellum is perfect for sketching and designing. It's easy to use and durable enough to last. It has been transparentized, but harsh chemical solvents weren't used to achieve this level of transparency. This vellum is made from new cotton fiber and is transparent as well as strong. You can use both ink and pencil on this vellum and achieve just the look you want for your design. This vellum is durable long term with its archival quality. It's strong abd ready to take on your writing and drawing. And when you want to make changes, this vellum is also erasable and leaves behind no ghosting. Redraw without making your design look sloppy with this high-quality vellum. It is available in both plain sheets and with blue grids that fade out. It is 68gms/meter2.