Pitcher with Pincered Wraps CMOG 68.1.2

Immediately after adding a trail of molten glass to the side of a vessel, it can be decorated by pincering. The video shows how quickly this must be done: the glass stiffens quickly as it cools.
In Jerusalem, sometime about 40 B.C., it was discovered that molten glass could be inflated. To make this phenomenon useful and practical, manufacturing processes had to be invented. This occurred during a rapid expansion of the Roman Empire that eventually included the entire Mediterranean Basin and extended to the far eastern coast: present-day Israel. Through an extensive trade of goods and the widespread movement of people and know-how, glassblowing found its way to the Italian peninsula. It took root and developed quickly. Glassblowing spread to become-then, as now-the predominant method of making glass vessels. Learn more at romanglassblowing.cmog.org.
The resource is a follow-up to Gudenrath's popular Techniques of Renaissance Venetian Glassworking (renvenetian.cmog.org) and Technique of Renaissance Venetian-Style Glassworking (renvenetianstyle.cmog.org/)

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I see a pair of tweezers with extra arms, say they.