Magtec Mid-Back Office Chair with Breathable Nylon Mesh, Padded Height Adjustable Arms, Synchronic Mechanism, Black Breathable Nylon Mesh Height Adjustable and PU Padded Armrest Synchronic Mechanism 100 mm (3.94 Inch) Level Three Gas lift 5.350 mm (0.21 Inch) Aluminum Base Casters Chair height 38.58-42.52-Inch, Height seat to gound 17.32-21.26-Inch