Stone paper is a revolutionary paper product made from calcium carbonate powder – 100% tree free, anti-static, acid free, no grain direction, water resistant, grease resistant, tear resistant and insect resistant.; 450 GSM cardboard cover with 60 pages 144 GSM ruled stone paper; Includes a click action ballpoint pen with natural, recyclable paper barrel;Metal dual-ring binding and elastic pen loop; Ink Cartridge: black, medium-point; Product Size: 5.5" w x 7" h;