Alvin Alva-Line tracing paper pads. Tracing vellum is a medium-weight 16 lb. basis vellum paper manufactured from 100% new cotton rag fibers with a non-fading blue-white tint. Finely-grained surface that is excellent for pencil and pen receptivity. 100 rag Alva-Line tracing paper advantages include: leaves no ghosts, smudges, or smears when erasing; high tensile strength prevents tears; resists aging and yellowing. Alvin 6855-series 100 rag vellum tracing papers are made in the USA.