Features 1. Silent & Smooth Gliding: Our office chair casters heavy duty are designed with precision to ensure that they will not be stuck by hair, wool or dust. Double ball bearing and rubber material is the reason that the wheels roll silently and smoothly. There won't be any squeaking sound during use. 2. Swivel 360 Degrees: Swivel casters designed with double ball bearing make the casters low frictional resistance and high speed limit, easier to move. Plus 360 degree rotation top plate, a little strength can easily transform any direction that you want. 3. Suitable for Most Chairs: Wheels for office chair with a standard stem size(1 inch, 1.5 inch, 2 inch). The wheels are designed to fit most standard chairs and will not change the height of the chair after installation. 4. Easy to install: Our office chair wheels can be easily installed without changing tools or hardware. Just pull the old casters out of the chair base and push the rod of the new chair casters into the socket. 5. Safe Protection for All Floors: These office chair wheels (set of 4) are made of tpr material and strong steel bracket, precision double ball bearings. High quality chair casters are guaranteed not to scratch or leave marks on any floor. Specification Material: Metal, TPR Color: Silver Size: 1 inch, 1.5 inch, 2 inch Weight: 125 g, 300 g, 480 g Package Include: 4× Wheels