... , uses its body structure hold the ink, and with an automatic valve controls the liquid flows directly ... a large reserve supply of ink, a fast flow and the ink iscompletely protected in the pen.3. ... This product can be refilled with ink, and the nib can be replaced. Itcan be re-used ... USES , for pen,for chalk,for present, use on company, on school,on catering and so on, can use on any smooth surface.