Holkie Office Chair Wheels 11X22Mm Silver Replacement 3 Inch Desk Roller Blade SMOOTH AND QUIET GLIDING: Precision ball bearings and a soft polyurethane wheel-shell make chair rolling and swivel silky smooth and quiet on any surface. Ideal for shared office spaces, professional gaming environments or even near your sleeping babies in the home office. SAFE FOR ALL FLOORS: Covered with a high quality, extra thick, non-marking soft polyurethane layer office chair rollerblade wheels are avoiding to scratch or leave marks on any surface (including hardwood, carpet, tile, laminate and more). STURDY HEAVY DUTY STRUCTURE: Heavy duty caster wheels steel casing, the maximum load capacity of wheels-set of 5 is up to 200kg and has passed the highest level TUV test. EASY INSTALLATION: Plug-and-play, no tools required! Simply pull out your old chair castors and insert the new ones. So you can start experiencing smooth and quiet gliding! STEM SIZE AND WARRANTY: Stem size with 7/16" (11mm) diameter x 7/8" (22mm) length, fits for most chairs EXCEPT FOR IKEA. 1 year warranty, free replacement. Please do not hesitate to contact us if you need any assistance.