Purchased because my mixed media sketch pads were absorbing too much ink. These Ohuhu sketch pads are very thick, sturdy and professional feeling. They include a ribbon bookmark, elastic band to keep them shut, a pocket on the back cover to store swatch cards or artwork, and a protective sheet to prevent bleeding. The paper is really smooth and the alcohol markers blend really well on it. I swatched all of my Ohuhu markers on a page and didn't experience any bleeding, however they do show through clearly on the back. I doubt they're "bleed proof," but they don't bleed as easily as a regular sketch pad. The only drawback for me is they do not lie flat like a wire bound sketch pad. I didn't deduct stars for this because they do sell a wire bound sketch pad, but I preferred the look of these. Much more professional.