Manual production technicians need about 10 years of training before they can truly operate the production process independently; When potassium glass melts to a viscous state, it sometimes leaves individual bubbles. Hand technicians pick up a crystal ball containing a bubble at one end of a long steel pipe, turn it, blow it into shape, and then go through a series of hand-made procedures, such as cutting, polishing and so on, a crystal glass can be finally formed. And not every hard work is successful. According to the introduction, about every 50 crystal balls, that is, the technician every 50 times to play the exquisite craft to make a perfect handmade crystal wine glass. This is also the reason for the small production and high cost of handmade crystal wine glasses.