1. Important! Before purchasing, determine the correct wheel size to the nearest millimeter! These wheels have a 10mm x 22mm axle. (They fit IKEA chairs). 2. Safe Compatible with all hard floors. Protect your floor with our soft yet robust polyurethane wheels Compatible with your floors. The wheels leave hardly any scratches on the floor, perfect Compatible with tile, parquet, laminate, wood, marble, granite, stone, concrete or vinyl floors. 3. Silent, robust. The durable polyurethane wheels Compatible with office chairs do not wear out, glide silently thanks to our swivel casters. Our chair wheels Compatible with 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 280 kg! Strong and robust. 4. Easy installation. The wheels are quick and easy to install without tools. Remove the old office chair wheels and push in the new wheels until the pin is securely seated. Note: All data is manual measurement, please allow 1-3 cm error, due to light and screen differences, there may be a certain color difference, depending on the physical object received. Delivery quantity: (according to the main picture) Buying our products not only means you get high-quality goods, but also that you can enjoy our careful customer service. Our customer service is always available Compatible with providing you with help and support at any time.