... pen writing words on glass,tile,marble 1.easy ues 2 ... engravable surface engraving pen writing words on glass,tile,marble The Signature Engraving Scribe pen is ... or patterns.Materialnatural diamond & tungsten carbideApplicationUsed on glass,china,metal plate,etc.AdvantageCompetitive price and using ... use.2. Also used cutting tiles and glass ,for marking purposes such as inscribing identification ...