50 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.. 50 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.