Kilimanjaro Original Bright White Watercolor Paper is made of super white 100% cotton rag sized internally and externally with plant-based, synthetic sizing. It is archival, acid-free, and chlorine-free, and is tough enough to handle lifting, scraping, and scrubbing. Created for both quality and value, it meets the demands of the most discerning professional artists. As always, you have Joe's 100% guarantee! This artists watercolor paper is ideal for watercolor, gouache, ink, acrylics, drawing, and printmaking, and is strong enough to handle multiple washes of color, masking fluid, and artist's tape without damage to the surface. Available in 140 lb. and 300 lb. weights with a beautiful cold pressed texture. We're proud that Kilimanjaro is ecologically sound in its production, using hydroelectricity to generate a savings of 26,000 tons of CO2 emissions and recovering/purifying used water for future productions. It also only uses plant-based materials and synthetic sizings - another notch towards sustainable production processes. These watercolor blocks are bound on 4 sides in convenient blocks with a fold-away cover, ready for painting with no stretching required. Try them for plein air painting! Manufactured at Cheap Joes Art Stuff, Boone NC with components made in Italy and the US.