hard floor casters for all surfaces, office chair casters Product name: furniture casters Material: Nylon Installation Size: 11x22mm color: gray Load: 20-25 kg Package Contents:5x wheels.To notice:1. There may be 1-2cm error in manual measurement, please understand.2. Due to different monitors, there may be errors in the color of the actual object and product images.Versatile use - the wheels can be used on any surface: carpet, hard floors, laminate or parquet. Thanks to high-quality plastic, the rollers of swivel chairs are quiet and move smoothly and do not damage the valuable floor. Universal size - rollers with a diameter of 50 mm and a shaft diameter of 11 mm are suitable for the most popular models of office chairs. To be safe, please measure the pen opening on your office chair before placing your order.Movement adjustment office chair wheels change their direction and adapt to your movements. They are particularly suitable for hard floors and ensure that the chair rolls easily and evenly on the floor. Quiet operation - glide around your office chair as you like. Also in the evening in the home office, thanks to our office chair wheels, no one will disturb your work. It is also suitable for players who play deep into the night.Tip - To be safe, please measure the opening of your pen on your office chair before placing your order.