Manufactured from the highest grade 100% new rag stock, in Artesian water, slowly run to build up higher tensile strength (resistance to folding and tearing) than usually found in 100% rag papers. Alva-Line offers a non-fading blue-white tint (Series 6855). Series 6855 is a medium weight (16# basis/.00275 thickness) tracing vellum made of 100% new cotton rag fibers. The finely grained surface has excellent pencil and ink receptivity and non-ghosting erasure characteristics.