High-quality 16 lb. 18" x 24" Vellum pad is perfect for technical drawing, tracing, blueprints and more! 50 page pad features 100% Rag fiber with medium transparency and tear-resistant sheets. Smooth finish takes graphite, pen and ink well! Acid-free paper pads are made in the USA and feature a thick cardboard backer to avoid bending and warpage during use.