Strathmore 300 Series Mixed Media Pads are perfect for watercolor, gouache, acrylic, pastel, graphite, ink, marker and other dry media. Forty 90 lb., vellum sheets are wire bound and micro-perforated for easy removal and measure actual-size after being torn from the perforations and removed from the pad. Note: the 5.5x8.5 pad is not perforated, but still measures actual size when removed at the wire binding. The 9x12 and 11x14 pads in this series are perforated.