Treat yourself to greater seating comfort! The P4 (OPA) adjustable armrests from Topstar significantly enhance the seating comfort of your Open X (N), Open X (P), and Unni Med office chairs, because the height-adjustable armrests let you lean back and give your arms a well-deserved rest. The ideal accessory for your office chair The adjustable armrests can be adjusted without tools-find the right position easily and comfortably. The adjustable armrests are made of plastic and are easy to clean. With their neutral black color, the armrests match all seat covers.