The Daler Rowney Langton Spiral Pads contains12 sheets 300gsm/140lb acid free watercolour paper. This paper has a 'Rough' surface. Langton water colour paper is colour stable and mould made. The paper in these pads is spiral bound along the short edge.
The best watercolour papers are acid free to prevent the deterioration of paint and to preserve the integrity of the paper over time.