Gridded Magic Cloth Water-Writing for Practicing Chinese Calligraphy or Kanji (Thicker)
This item with yellow cloth is much better than the black one: it's thicker, odorless and produces sharper image. It's newer and hence not as well known. Because of that, it's on sale momentarily. Instruction:  Use your favorite brush and write as usual with clear water. In 5-10 mins after cloth is dry all will disappear. CARE: cloth can be washed with water to remove dirt or odor. Don't scrub, wash with hands.