The color can immediately change after drawing and a few minutes later the drawing things will disappeared. It is reusable and can play with again and again. No ink and no chemicals just water for the dye so it does no harm to your baby. Manufacturered by FRECI. The painting cards are convenient for kids to paint which can arouse the interest and curiosity of your baby and the design of the pen make babies feel comfortable. Material: paper.Size: Approx. 15*8cm/5.91*3.15'';Pen length: Approx. 10cm/3.94''. This product is designed with the concept of environmental protection. The only dye of it is water which means kids just can use water to draw on the card board.