Boss Modern Conference Chair with Aluminum Arm & Base (B8886AL-AMBK) EachThis chair features an aluminum base and matching, fixed, aluminum arms. The chairs is upholstered in antimicrobial vinyl which provides a great look, in addition to helping prevent the spread of germs and allows them to be easily cleaned. It comes equipped with a 2 to1 synchro tilt mechanism, which permits both the seat and back to recline. The chair can also be locked in any position throughout the tilt range for a personalized seating experience.