context: Chopper (from English: chopper - chopper, drummer) - one of the oldest tools of the Paleolithic era. Refers to the so-called. “Pebble guns” (English: pebble-tool, French: galet amenagée). The chopper was extremely simple to manufacture and consisted of pointed pebbles or boulders up to 7.5-10 cm in size. The working edge was created by several chips produced on one side only and had an irregular shape. The rest of the gun was left untreated and served as a place for capture by hand. For the manufacture of several later guns, "chopping", a chip was made on both sides. Moreover, chopping easily turned out to be chopping. Later, a much more thoroughly beaten tool appeared, which in Russian archeology has the name "chopped".
question: What is the shape of choppers?
answers.text: irregular