Hahnemühle : William Turner Watercolour Block300 gsm 100% rag cold pressed 30x40 cm This high quality, 100% cotton rag, mould made watercolour board is natural white, acid free, lightfast and extremely age resistant. The Pads are glued and gauzed to ensure flatness when wet. All sheets contain the Cockerel watermark and have genuine 4 sided deckle edges. The smooth, slightly irregular surface structure is ideal for professional artists. Turner is suitable for all wet painting techniques: