Thick Premium Paper: Our 140lb 330gsm watercolor paper is heavy weight and thick enough to prevent paint from bleeding through. This professional artist grade watercolor pad 9x12 or 11x15 is acid-free with a neutral pH to keep your work looking rich and vibrant. The pages of our premium water coloring paper are natural white, cold press and the ideal tooth for watercolors, watercolor pens , watercolor brush pens and other wet media. Our high quality watercolor paper will not warp or curl. Acid-free and Detachable Sheets: Our acid free watercoloring paper is fade-resistant to keep your work looking great over time. Our watercolor pad is glue bound so you won t have to worry about the pages falling out. The pages of this mixed media pad can be easily and cleanly detached from the spine. This watercolor paper 140 lb cold press pad is extremely portable and fits comfortably into a backpack. Th