Knee Sit Backless ChairAn economical choice, designed to reduce stress and pressure on the lower back by redistributing weight between the pelvis and knees. Steel construction with powder coated black frame and thickly padded foam cushions for added comfort. Seat height and angle adjust manually. Locking dual-wheel casters. Meets ANSI/BIFMA standards. 18-5/8w x 24-1/2D. Seat: 17w x 12-1/2D. Knee pad: 19w x 11d. Shpg. wt. 20 lbs. Assembly required.Black.