For lettering, card writing, signatures and sketching. Disposable calligraphy pen. Acid free, water based pigment ink is water resistant and fade proof. Available in 4 line widths, 1.0mm, 2.0mm, 3.0mm and 4.0mm. Xylene Free. Purchasing unit each, to purchase a box order 12 pens. Also available in a wallet of 4 which includes one pen in each line width. Purchasing each unit.