Vellum Isometric Paper Non Repro 16lb 1000h 08.5x11 Pad 50 - Vellum Grid Paper Isometric Non Repro Sheets 16lbs - The finest product you can buy for manual drafting. This 100% new cotton fiber media is transparentized without solvents to produce the proper translucency as well as the legendary Clearprint archival quality, strength, erasability (with no ghosting) and redraw characteristics. Good for pencil or ink. 16lbs. (68gms/meter2). The Isometric grids are available in sheets or pads.