The castors lock automatically, when the chair is not in use. These castors are designed for soft floors. PARAGRAF castors for hard floors are sold separately. May be completed with KOLON floor protector. Castors included.
You sit comfortably since the chair is adjustable in height. http://www.ikea.com/jo/en/images/products/jules-junior-desk-chair__0114375_PE266810_S4.JPGJULES Junior desk chair, redhttp://www.ikea.com/jo/en/catalog/products/S59884560/598.845.60JD 49