Professional Watercolour Paper is a mould made high quality and durable 100% cotton paper with a bright natural whiteness of archival quality.It offers the highest quality surface for smooth, even washes, preserving lustre and transparency of colour without degrading over time. Internally and externally sized for optimal water absorbency, pigment dispersion and lasting colour adherence. Acid-free, archival and non-yellowing to preserve your work. Watermark in sheets as a quality credential.Includes 20 sheets glued on all 4 sides. 300gsm / 140lb weight.22.9 x 30.5 cm / 9 x 12".Rough. Rough paper has a pronounced tooth for achieving watercolours paintings with the most texture and granulation effects.