Treat yourself to a higher level of seating comfort! The P4 (OPA) adjustable armrests from Topstar enhance the seating comfort of your Open X (N), Open X (P), Unni Med office chairs many times over, because the height adjustable armrests mean you can sit back and give your arms a well-deserved break. The ideal accessory for your office chair The adjustable armrests can be adjusted without tools - you can find the right position easily and conveniently. The adjustable armrests are made of robust plastic and are easy to clean. The neutral black colour means the armrests match all seat covers.