1. Whether the process is artificial blowing or machine pressing, the labor cost is higher
2. The stem of the red wine glass is integrally formed, whether it is spliced twice or thrice spliced. The one-piece molding has the best firmness, and other cup stems are easy to break
3. Whether there is a strengthening process on the mouth of the cup, and it is fragile without strengthening
4. Brand value of wine glass manufacturers"