Tango 601 GreyErgonomic design, extra large 120 degrees, relaxing with body 4D armrest design can be adjusted front and rear up and down 360 degree rotation Handrail adjustment inside and outside Headrest adjust height angle with neck Seat can be adjusted before and after Chair back angle can be fixed and adjusted Aluminum base, wheel for medical PU wheels Meets ANSI BIFMA Safety and Performance Standards of the American National Standards Institute Specification