Warranted for continuous 24-hour use. 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. Global Product Type: Chairs/Stools-Chairs with Casters. Seat/Back Color(s): Black. Features and Functions: 360' Swivel Back Height Adjustment Pneumatic Seat Height Adjustment Tilt Tilt Lock Tilt Tension. Arms Included: Yes. Base/Leg Type: 5-Star. Base/Frame Material(s): Steel. Base/Frame Color/Finish: Black. Back Material(s): 100% Polyester. Back Width Maximum: 18-1/2". Back Height Minimum: 19-3/8". Back Height Maximum: 22-1/8". Arm Height From Seat: 5-1/2" to 7-1/2". Distance Between Arms: 18-1/8" to 20-1/8". Arm Style: Padded Slant T-Bar. Arm Color: Black. Arm Material(s): Polypropylene Polyurethane. Arm Adjustability: Height Width. Number of Casters/Glides/Wheels [Nom]: 5. Caster/Glide/Wheel Type: Standard Casters. Wheel Tread: Hard. Seat Material(s): 100% Polyester. Seat Width Maximum: 20-1/2". Seat Depth Maximum: 19-3/4". Seat Height Minimum: 19". Seat Height Maximum: 22-1/2". Width Minimum: 25-1/4". Width Maximum: 26-7/8". Depth Maximum: 26". Height Minimum: 35". Height Maximum: 38-5/8". Quantity: 1 each.