... pen 3.use on any engravable surface hard alloy engraver for glass,china,marble The Signature Engraving Scribe pen is an easy ... .Materialnatural diamond & tungsten carbideApplicationUsed on glass,china,metal plate,etc.AdvantageCompetitive price and using convenient. uesd for & used on 1. It is ... a crack in it or tap it on the back.5. When drawing lines, hold the pen at 45° angle.Experiment ...