These Fabriano Artistico Watercolour Blocks are 300gsm/140lb mould made, 100% cotton, chlorine and acid free.Quite simply this is the finest paper manufactured by the Italian paper mill.It contains no optical brighteners or chlorine, is acid free and pH neutral and therefore is highly "work" and eraser resistant. The internal and surface sizing makes for perfect colour take up and allows for all watercolour techniques.Glued on all four sides there is no need for soaking or stretching.Size 35.5 x 51cm (14x20ins). Hot Pressed finish for a smooth surface. This paper is suitable for watercolour, gouache, acrylic, ink, charcoal and drawing. 15 sheets.