... 4.use for metal, chinaware, marble, glass, jade etc electric engraving pen 1.Personalize your valuables and add decorative flourishes ... part is tungsten alloy, is very durable.3.the switch of electric engraving pen is in hand grip place. TypeYSSB-IIPower ... Price attractive TypeYSSB-IIIPower supply voltage220V/50HZTotal power15W,0.4ADiameter of the nib 3 mmLettering depth0.1-0.5mmRepeat characterizes ...