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Material: Spandex; Polyester Washable, Durable,Can fit most office chair Reference size:backrest width: 15-17.8 inches(38-45cm),the height of the backrest: 13.8-15.8 inches(35-40cm), cushion width: 18.1-20.5 inches(46-52cm), the height of the cushion: 17-19.7 inches(43-50cm).