Unique Self Adjusting Spaceflex Back and Raven Mesh Seat Managers Chair Raven Self Adjusting SpaceFlex Back and Raven Mesh Seat Managers Chair with Adjustable Arms and Nylon Base. Pneumatic Seat Height adjustment, 360¿ swivel, 2 to 1 Synchro Tilt with tilt tension and lock Free Ground Shipping (UPS / FedEx / Curbside) 86 REVV Series collection Part of the Space Seating series Overall Dimensions: 27.25"w x 24"d x 44"h Seat Dimensions: 19.25"w x 19.5"d Back Dimensions: 21"w x 19"h Seat Height: 18.25"-22.5" Raven Black Back and Seat with Black Base SpaceFlex Plastic and Mesh