High Quality: These durable, lightweight office chair casters boast a high weight capacity (up to 450 kg). Hard floors are protected with high-quality polyurethane, preventing damage and saving you money on costly repairs. Quiet and Smooth Rolling: Dual-wheel design minimizes strain, providing stability and easier maneuverability than single-wheel casters. The high-quality rubber wheels roll quietly and smoothly. Work late or game without disturbing others, allowing you to focus on your tasks. Versatile Application: Suitable for tile, parquet, laminate, concrete, or vinyl flooring. These 11 mm x 22 mm high-quality casters fit a wide range of chairs, including luxury leather chairs, computer chairs, home office chairs, and more. Please measure your chair before purchasing. Easy Installation: No tools required! Simply remove your old casters and slide in the new ones – it's that easy. Installation takes less than 5 minutes. Color: Gray + Black Material: Plastic Package Contents: 5 x Chair Casters Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the real thing. The allowable measurement error is +/- 1-3 cm.