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A kind of chair · also called Stacking banquet chair, Event chair

About
A banquet chair is a compact, stackable seat designed for event halls, conferences, and formal gatherings.
These chairs are slightly narrower and lighter than standard home dining chairs to fit more seats around event tables. Most use hollow steel or aluminum frames, which keeps them light enough for staff to stack ten or more high on rolling dollies. Seat heights are designed around standard 30-inch table tops, though backrest styles range from rounded tops to square crowns.
From Wikipedia
A chair ( ) is a type of seat, typically designed for one person and consisting of one or more legs, a flat or slightly angled seat, and a back rest. It may be made of wood, metal, or synthetic materials, and may be padded or upholstered in various colors and fabrics.
Read more on Wikipedia →Text from Wikipedia’s “Chair” article, CC BY-SA 4.0.
1 on the site
Weight
12.1 lb (5.5 kg)
Quick answer
A banquet chair stands about 35 inches (0.9 m) tall, measures 20 inches (0.5 m) long, and weighs around 12 pounds (5.5 kg). Its top backrest reaches just below the waistline of an average adult.
Typical figures, the same ones every comparison on the site uses; real ones vary.
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Next to anything: a person, a car, another chair.