This is a watercolor paper “Brick” which includes 30 sheets of 13cm diameters, 100% cotton, acid-free, 140lb/300gsm academy grade watercolor paper. It is in a pocket size with two spots glued, which allows you to either take a few sheets or a whole BRICK with you to work on plein air painting OR studio painting. A good amount of practices needed before a beautiful painting was created. As everybody knows, good watercolor papers are PRICEY. Baohong watercolor Academy grade paper is a good alternative in compared to other high-end (price-wise) big name brands! Compared to other watercolor papers which are not made from 100% cotton, these cotton watercolor papers are both in high quality and reasonable price, whether you are painting with watercolor paints, markers, pencils, ink, charcoal for painting, sketching, printmaking or drawing, these papers would provide an optimum performance and deliver extraordinarily brilliant colors.