This 28cm by 36cm pad of Yupo White Polypropylene includes 4.5-70kg. sheets that are pH neutral and have a smooth finish. Yupo is waterproof, stain resistant, incredibly strong. Watercolour professionals have found this surface to be very receptive for a variety of techniques. The surface may be wiped clean to restore the original white of the sheet, making it an excellent surface for beginners. Made in the USA.