This is the Stonehenge multicolor paper which contains 5 assorted colors of their fantastic paper.
From the manufacturer:
Stonehenge Pads all contain 250gsm paper and are Made in USA, 100% Cotton, Neutral ph, acid free, Chlorine free, 2 deckles sheets, and Buffered with calcium carbonate. Stonehenge has the ability to take multiple layers of wax-based and oil-based colored pencil without any buildup, allowing colors to penetrate and absorb into the surface of the sheet. Stonehenge is also an excellent silkscreen paper with its ability to take as many as 50-75 colors, printed one color at a time, and maintain perfect color registration as a result of its incredible dimensional stability. applications: hand Lithography, Intaglio, Letterpress, Offset, Pen & Ink, Pastel & Charcoal, Relief Printing, Silkscreen, Stationery, Watercolor.