Pneumatic Stool w o Back Aluminum Base Hearing Aid custom upholstery available upon request Color:Blue custom upholstery available upon request *Disc weights not included *Permitting hip extension exercises hamstring curls quadricep strengthening exercises as well as upper extremity exercises *The tapered backrest is operated by gas spring and adjusts from 0¯ to 90¯ *Adjustable headrest (removable) *Contoured handholds with non slip grips *Thigh support strap (removable) *Two permanently mounted chrome plated torque units with sealed ball bearings *Each torque unit has one adjustable 6 weight holder and one 8 screw in weight holder *30 wide x 22 deep x 30 high *Back height 27 1 2 to top of headrest *Top upholstered in Black vinyl output level ≤125+3dB Max OSPL90 ≤125+3dB Average OSPL90 118±3dB Max Gain 45±5dB FOG50 HFA Avg load capacity under normal use Premium 23 die cast aluminum base with satin finish top * 5 leg design for greater stability * Full size diameter top and base for comfort and stability * 4 thick seat for extra comfort * Black hooded dual wheel nylon casters * Pneumatic height adjustment * All seats have 3 4 thick solid plywood base * Lever controls height * Knock down design saves on shipping * Easy no tools required assembly * Premium stain resistant woven knit backed vinyl upholstery * 250 lbs