Strathmore’s 100% cotton Sequential Bristol Boards are perfect for pencil, colored pencil, sketching sticks, and specialty pens and markers. The Plate Surface has an ultra-smooth finish that is ideal for detail work using traditional pen-and-ink tools, specialty pens and markers, and airbrush. The Semi-Smooth Surface is slightly textured making it well-suited for pencil, pen-and-ink tools, and specialty pens and markers. Pads each contain 24 sheets of 2-ply board. - Strathmore 300 Sequential Series Bristol Pad - 11" x 17", Smooth, 24 SheetsSequential Art 300 Series Bristol, 11X17 SMOOTH PAD - An economical, 100 lb (270 gsm), acid-free, acid-free bristol, is available in three sizes and two surfaces. Choose the Smooth Surface for traditional and specialty pen-and-ink tools, and the Vellum Surface for pencil, charcoal, sketching sticks, airbrush, and pen-and-ink. Both also work well with markers. Pads and packs each contain 24 sheets.