An office chair, or desk chair,is a type of chair that is designed for use at a desk in an office. It is usuallya swivel chair, with a set of wheels for mobility and adjustable height. Modernoffice chairs typically use a single, distinctive load bearing leg (oftencalled a gas lift), which is positioned underneath the chair seat. Near thefloor this leg spreads out into several smaller feet, which are often wheeledand called castors.

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