High quality: office chair wheels are durable, lightweight and have a high load capacity (up to 450 kg). Hard floors are coated with high-quality polyurethane - this provides protection against floor damage and marks and saves money on expensive floor repairs. Quiet and smooth: double wheels are perfect for reducing stress. This gives you stability and makes steering easier than with a single wheel. The high-quality rubber wheels on the office chair are quiet and glide smoothly. Even if you work at night or play games, you don't have to worry about disturbing others, so you can focus on your work. General application: office chair can be used for tile, parquet, laminate, concrete or vinyl floors. These 11mm x 22mm high-quality wheels can be mounted on a wide range of chairs, e.g. luxury leather chairs, computer chairs, home office and other office chairs. This is a good choice. However, they are not suitable for use on chairs. Measure before buying. Easy installation: no tools are required for installation, it can be done manually. Just take out the old office chair and slide in the new wheels and it's already assembled. It doesn't even take as long as drinking a cup of coffee before your chair is revived. The whole process only takes 5 minutes. Color: Gray+black Material: plastic Package contents: 5 x chair wheels Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture to be a little different from the real thing. The allowed measurement error is +/- 1-3 cm.