jersey seating&reg; PU Leather Hydraulic Lift Adjustable Counter Bar Stool Dining Chair Black (153) Sleek chrome metal base, PU Leather Cushion seat. Back Of Seat Height :7 Side lever adjusts seat height up and down, swivel chair design so you can turnaround. Light assembly required, not recommended for over 200 lbs. We constantly update our items following customers reviews, since then this item's base has been widened to 16.5" so it stands more confidently.