Fit IKEA Chair ONLY: Please make sure your chair caster stem size is the same as 10*22mm, or these caster replacements wont match with your chair. Heavy Duty: Each caster is able to bear up to 30kg, and whole set of 5 together can bear up to the maximum weight of 150kg, safe and stable for all people. Smooth & Quiet: Smooth and quiet glide are the priorities for office chair wheels. These caster wheels are very flexible when rolling the chair; no much noise with premium rubber, great choice for office. Perfect for All Floors: Made of nylon rubber, these casters are made to protect hardwood, laminate, tile, slate and all other hard floors from damage and scratches. Simple Installation: Just follow the instruction with a few simple steps then good to go, no tools required for installation, easy for everyone.