9000 E 300 lb. weight capacity Pneumatic height adjustment Seat foam density: 2 lb., 55 IFD 360 swivel Adjustable backrest with lumbar support 5 leg base in polished aluminum 20 Adjustable chrome footring Static dissipative upholstery with a resistance of 10 to 10 ohms Comply with ANSI/ESD ST12.1-2006 standards 12 year warranty Made in the USA Back Dimensions Seat Adjustment Seat & Model Seat Dimensions Footring Height Back Tilt 9050M-E 20 w x 18 d, 3 thick 17 w x 16 h, 3 thick 15 - 21 No No 9051M-E 20 w x 18 d, 3 thick 17 w x 16 h, 3 thick 15 - 21 Yes No 9350M-E 20 w x 18 d, 3 thick 17 w x 16 h, 3 thick 19 26 No 20 Adjustable Chrome 9351M-E 20 w x 18 d, 3 thick 17 w x 16 h, 3 thick 19 26 Yes 20 Adjustable Chrome 9550M-E 20 w x 18 d, 3 thick 17 w x 16 h, 3 thick 21 31 No 20 Adjustable Chrome 9551M-E 20 w x 18 d, 3 thick 17 w x 16 h, 3 thick 21 - 31 Yes 20 Adjustable Chrome 9050L-E 20 w x 18 d, 3 thick 17 w x 19 h, 3 thick 15 - 21 No No 9051L-E 20 w x 18 d, 3 thick 17 w x 19 h, 3 thick 15 - 21 Yes No 9350L-E 20 w x 18 d, 3 thick 17 w x 19 h, 3 thick 19 26 No 20 Adjustable Chrome 9351L-E 20 w x 18 d, 3 thick 17 w x 19 h, 3 thick 19 26 Yes 20 Adjustable Chrome 9550L-E 20 w x 18 d, 3 thick 17 w x 19 h, 3 thick 21 31 No 20 Adjustable Chrome 9551L-E 20 w x 18 d, 3 thick 17 w x 19 h, 3 thick 21 - 31 Yes 20 Adjustable Chrome ESD Options: CARD5S Dual wheel hard floor casters for all models (set of 5) CAPD5S Dual wheel carpet casters for all models (set of 5) CAR5E Single rubber wheel casters for aluminum bases (set of 5) IBCS-ESD Dual wheel interval brake casters (auto brake when not seated) (set of 5) A8 Adjustable arms 02 Control Separate seat & back tilt levers (available on tilt models only) MEG 1 Mega Ohm Resistor Colors: Static Control Vinyl blue, black Static Control Fabric slate blue, navy blue,gray, ebony