1íówriting disappears spontaneously when left to stand for 15 minutes to 4 days. 2íócan be write on paper, fabric, wood, leather etc.. 3íóspecial use for students writing on scribbling pad, writing practice, or doodling for children. 4íóthe pen can also be used on industries, especially use for dressmaking, shoemaking, handicraft, embroidery, artificial flowers, etc.. For temporary marking. 5íóenvironment protected products. **use scope: wall, clothing, paper, bedsheet. The painting board series with 1pc of painting board, 1pc of erasable board and 1pc of scribble pen. The suit series with 3 colors children scribble pen, 1pc of cleaning pen and 6pcs of painting board. The scribble painting book series with 1pc scribble painting book, 3pcs of scribble pens and 1pc of cleaning pen.