1íówriting disappears spontaneously when left to stand for 1-10 days. 2íóerasable easily and quickly by water and eraser pen. 3íóthe vanishing time may vary with material and size of the fabric and surroundings such as temperature, humidity and air circulation. 4íócan write on any surface, especially use for dressmaking, shoemaking, handicraft, embroidery, artificial flowers, etc.. Use for temporary marking. 5íówe have variety of outer tubes and nibs for your choice. 6íónontoxic ink. **use scope: wedding yarn, brocade, pure cotton etc.. Method 1: medium box: 12pcs per dozen, 10dozens in one medium box, 12 medium boxes in one outer case. Method 2: 200pcs in one medium box, 8medium boxes in one outer case.