Assembly: Hardware and necessary tools included Set up according to the instructions on the desk chair Swivel Caster: Chair can be rotated 360 degrees. The casters are suitable for hard floors, carpet floors, and can be rotated without noise and scratch the floor Backrest: Open mesh construction for ventilation backrest Resilient mesh allows backrest to be aligned MULTI-FUNCTIONAL: Pneumatic control allows you to adjust the height of the seat up and down in locking mode, pull out the handle to start rocking and stop when pulled out, load up to 113kg If the information listed in the "product measurements" and "product size" differ, the size listed in the "product measurements" is the correct size for the [Amazon.co.jp Official Import Handling]