Strathmore 400 series Mixed Media for studies or finished artwork, this 140lb heavy-weight vellum surface is specially sized for wet media. Great for watercolor, acrylic, pen and ink, pencil, crayon, charcoal, marker and collage. Easy-to-use flip over cover features sheets that stay in the pad, yet tear our cleanly. 15 sheets per pad, Acid free. This item is manufactured in United States.