Electric Engraving Pen 1.Light weight 2.Easy to operate 3.Exquisite and convenient 4. metal, chinaware, marble, glass Electric Engraving ... .the engraving pen is tungsten alloy, is very durable.3.the switch of the engraving pen is in hand grip place. TypeYSSB ... -IIPower supply voltage220V/50HZTotal power15W,0.4ADiameter of the nib 3 ...