2 x Retro Vinyl Hydraulic Lift Adjustable Height Swivel Office Desk Chair Red - Pack of 2 (8189) Made By jersey seating&reg; Vinyl Feel, Adjustable in Height with hydraulic lift and Swivel. Width: 18" depth: 17" Seat Height: 17"-21" Base Size diameter: 22" 5 Prong rolling Chrome base and Wheels.