Grumbacher Watercolor Art Pad 9" x 12"140lb/300GSM 30 Sheet Side Wired. Grumbacher pad has loop wire bound construction and features "In & Out" pages that allow you to remove sheets from the pad for painting and reworking. Grumbacher Watercolor developed with an optimized sizing level to good wet and dry lifting. This paper is great for kids to adults. Colors look bright and crisp on this surface. Acid and Lignin free formulation.