size:393*273mm(15.4*10.7inch), 1.Professional grade sanded pastel paper.Special paper for toner painting, soft pastels , chalk pastels, wet and dry painting.It's sandpaper. The surface of the paper is grainy, so it is easy to attach colors and hard enough not to bend. it is also made resistant to acrylic, alcohol and oil. When it comes to water it is resistant to some degree since the paper uses a high-weight substrate board that prevents warping in wet conditions. 2.This sanded pastel paper is acid free and tested by ASTM D-4236 and obtained TRA environmental certification. 3.The sanding process uses environment-friendly glue which gives no peculiar smell. 4.Our pastel paper is a granular surface with high-precision sanding. It can be painted up to 9 layers, and the color is preserved to the greatest extent.