Medium backrest with multiple tilting. Small size seat. Molded back for curves from a wood and elastomer support. Pneumatic height adjustment. from 16'' to 20''Sliding seat from 16.75'' to 19.75'' Eidth is 19.5'' with adjustable tension. Tension adjustment and blocking of tilting. Adjustable and sliding width of the arms G3. The armrests can move 360 ° and can slide over the seat to reduce the space between the arms.Black.