Pre-owned Knoll Generation Task Chair. In a world of prescriptive chairs with lots of adjustments, Generation has you covered with intuitive movement that takes the work out of sitting—so you can sit and get to work. With a Pebble Plastic back, Pebble Fabric seat and a Light Frame Color. Features: Pneumatic height adjustable Seat / Height Adjustable Arms / Tilt Lock / Seat Depth / Frameless Flex back / Flex Seat. Dimensions: 26" D x 28 1/2" W x 39 1/4" - 44 1/2" H. This chair has been professionally cleaned and has passed a multi-point inspection guaranteeing all ergonomic functions are in excellent working order.