High-quality, professional Alvin Draft-Art illustration boards with a super white surface. Cold Press features a medium tooth surface that's ideal for both wet and dry media, including watercolor, pencil, and charcoal. Comparable to Bainbridge #80. Hot Press illustration board features a super smooth surface perfect for detailed pen and ink or silkscreen work. Comparable to Bainbridge #172. White surface on all boards are securely mounted to warp-resistant chipboard with smooth, gray reverse side. 0.55 pt thickness. Quality-made in the USA.