100 Mandala Images A comfortable and convenient 8″ x 10″ size Mandala coloring books for adults relieve stress, aid relaxation and let melt away as you give your artistic side the center stage. Ease your stress with each stroke of your colored pencil or pen. Coloring original Mandalas is among the most popular adult coloring books. Every sacred circle will help you clear your mind and sharpen your creativity. This is the best quality book to color for men, women, and kids alike.