Giantex Pu Leather Ergonomic Mid Back Executive Computer Desk Task Office Chair Black Modern Design: Modern Style, Beautiful Generous And Strong Practicability, Will Keep You Comfortable And Stable All Day. Comfortable Seat: The Pneumatic Gas Seat Easily And Effectively Adjusted From Seat To Desk On Workstation. Ergonomic Posture Support:360 Degree Swivel Wheel And Chair Can Run Smoothly On Floor, Height: adjusted from 17.7"x20.8" Seating Area Dimension: 20.8"x18.9"(W X D);Back Rest Height From Seat: 20.8", Overall Dimension: 25.2" x22.4"x 40.1"(Highest) Package Include: 1 X Black Office Chair, Easy To Clean, Easy Assembled is required.