Professional grade watercolour paper blocks that are glued on all sides. Formats are ideal for outdoor painting.100% cottonCylinder mould madeRough grain, cold pressed140 lb (300 g/m)Acid freeBuffered with natural gelatine sizing for protection against environmental acidsContains an anti-microbial agent to resist mildewMade without optical brightning additivesPerfect for watercolours, ink, gouache, and acrylic