Transparent dual wheel office chair swivel wheel, silent wheel, furniture roller 1.The office chair casters can support up to 1,000 pounds, making it ideal for heavier people. Equipped with two clear double ball precision bearings and a shock-absorbing polyurethane tyre,the chair will not disturb others by making noise when moving,keeping your chair in pristine condition,a cost-effective option that does not require buying a new chair. 2.Whether you use our office chair castors on flooring, carpet, tile or wood, the improved shock absorbing polyurethane rubber office chair castors will protect your floor from scratches and marks, saving you money. 3.No tools are required for installation, it can be done manually.Just take out the old desk chair casters and slide in the new replacement office chair casters, and it is installed. You can also install it while you are on the phone because it only takes 5 minutes and your chair will be like new again. 4.These high quality swivel chair castors in 11mm x 22mm size can be used for a variety of chairs. Examples include luxury leather chairs, computer chairs, home offices and other office chairs.This is an excellent alternative.Please take measurements before purchase. Colour: black Size: 5.6*5CM Wheel material: polyurethane (PU) Includes: 5 chair castors