Alera - Wrigley Series High Performance Mid-Back Multifunction Chair, Black - Sold As 1 EachMultifunction mechanism allows back angle adjustment relative to seat, adjustable tilt (free floating or infinite locking positions) and forward tilt. Waterfall seat edge reduces pressure at the back of knees. Padded slant T-arms are height- and width-adjustable. Impact-resistant molded plastic shell. Five-star base with casters for easy mobility. Seat/Back Color(s): Black; Features & Functions: 360° Swivel; Back Height Adjustment; Pneumatic Seat Height Adjustment; Tilt; Tilt Lock; Tilt Tension; Arms Included: Yes; Recommended Applications: N/A.Multifunction mechanism allows back angle adjustment relative to seat, adjustable tilt (free floating or infinite locking positions) and forward tilt.Waterfall seat edge reduces pressure at the back of knees.Padded slant T-arms are height- and width-adjustable.Impact-resistant molded plastic shell.Five-star base with casters for easy mobility.Includes one chair.