1. Important! Before you buy, determine the correct wheel size to the nearest millimeter! These wheels have a 10mm x 22mm axle. (They fit IKEA chairs). 2. Safe for all hard floors. Protect your floor with our soft but sturdy polyurethane wheels for your floors. The wheels leave hardly any scratches on the floor, perfect for tiles, parquet, laminate, wood, marble, granite, stone, concrete or vinyl floors. 3. Quiet, robust. The durable polyurethane office chair wheels do not wear out, glide silently thanks to our swivel wheels. Our chair wheels for heavy chairs are made of industrial steel, precision ball bearings and durable chair wheels are made of polyurethane. They can carry loads of up to 650 pounds! Strong and robust. 4. Easy installation. The casters are quick and easy to install without tools. Remove the old office chair wheels and press in the new wheels until the pin is firmly attached. . Note: All data is manual measurement, please allow 1-3cm error, due to the light and screen difference, there will be a certain color difference, subject to the physical object received. Delivery quantity: (according to the main picture) Buying our products not only means that you have high-quality goods, but also that you can enjoy our meticulous customer service. Our customer service team is always available to provide you with help and support at any time