Strathmore 500 Series Illustration Boards for Wet Media, 15 x 22-Inch, 78 Pt This professional quality board has a strong durable vellum finish for traditional drawing techniques Surface: Heavyweight Vellum; Weight: 78 pt Size: 15 x 22 Inches; Sheets/Pkg: 1 In addition, it has been internally sized to accept wet media and can be used for light washes up to wet on wet applications