Borden And Riley #110M Technical Vellum Pad, 18" x 24", 16 lb. 100% Rag, 50 Sheets, is made of 16 lb. , bright white, pH neutral, 100% rag long fiber paper. It is transparent zed during manufacture for exceptional dimensional stability and accuracy. This paper contains no fugitive oils or resins and is crack resistant, durable and archival. Made in USA.