Swivel Armchair, Black 5-Star Base With Hard Castors, 2D Adjustable Arms, height adjustable with options for forward tilt and seat depth adjustment. Promatic option automatically adapts to the users weight and is a perfect chair for muliple users.
Chair Type: Office swivel chair with 5-star base (swivel, height-adjustable) complying with EN 1335/Seal of ergonomic approval.
Mechanism: Promatic mechanism.
Back: Backrest frame of polyamide with ventilated mesh back and adjustable lumbar support.
Armrests: 2D armrests
Seat: Seat upholstery of polyurethane foam, available in Plano or Silk mesh fabric.
Base: 5-Star base with hard or soft castors in basic dark.
Dimensions: 700-940mm Wide x 990-1100mm High x 660-795mm Deep
http://www.material-life.co.uk/furniture-and-accessories/chairs-stools/vitra-id-mesh-swivel-chair-by-antonio-citterio/