Dataprint 20 lb Manual Drafting Vellum 24"x36" 100 Sheets (1103) Dataprint Manual Drafting Vellum is made with 100% cotton. Our vellum will not discolor with age or use. Pencil lines flow on without constant resharpening and ink lines do not feather or bleed. Repeated erasures of the same line will leave no ghost. 100 Sheet Pack