Want a fun and creative way to relax without the stress of complicated designs or thin complex lines? This simple 6.5" x 6.5" square coloring book includes 51 super-cute & easy-to-color hippo designs with thick black lines, single-sided pages between each to prevent bleed-through, and hours of a fun and stress-free creative way to relax and unwind. Note : Remember to place a protective sheet (scratch paper) behind each page you are coloring when using markers . Perfect for adults and kids alike, as well as people with Parkinson's or other conditions that prevent them from coloring thin and cluttered pages/designs. Size is also perfect for when on-the-go. Fits in purse, bag, backpack, glove compartment, and easy to carry.