“These are just what I wanted for an office chair, and I couldn't find them in local shops. The felt pad allows the chair to slide easily across the floor, which is what you need with office chairs and is the reason they are fitted with castors. Moreover, they are made of strong plastic and don't flex when the chair is moved. (The castor cups I bought elsewhere previously were non-slip; they were completely useless and had to be discarded immediately.) The delivery was good and fast.”
