Chemical Pen, Writes on Multiple Surfaces, Long-Lasting, Quick-Drying - Broad tip, black ink - Pen tip sizes: 1 mm and 4 mm - Suitable for writing on various surfaces such as plastic, metal, PVC sheets, etc. - Quick-drying, odorless, and free from harmful Xylene and Toluene - Can leave the cap off for extended periods without ink evaporating Tax Invoice Request : - Customers wishing to receive a tax invoice can request one for orders with a total of 300 THB or more.