PERFECTLY SOFT AND QUIET ROLLING: Two precise bearings and a wheel shell made of soft polyurethane ensure fast and quiet rolling on any surface. Thanks to the third precision bearing in the rotating mechanism of the wheel, you can change the direction of movement of the chair with practically no effort. These office chair casters can be used as a replacement for chair mats. The quiet wheels feature precision ball bearings that glide effortlessly on surfaces without making noise. UPGRADE TO PREVENT FLUFF AND DUST: The new anti-lint/dust cover design prevents common floor hair, Dust, ceiling fluff, pet hair, etc. get caught in the wheels, making cleaning easier and pet-friendly EASY INSTALLATION AND UNIVERSAL STANDARD SIZE: 7/16" wide x 7/8" high (11mm x 22mm) . You can easily and quickly assemble these office chair casters without tools. Just snap them into place with your hands and you're ready to go EXTREMELY DURABLE STRUCTURE AND MATERIALS: The elastic high-tech polyurethane of our office chair casters makes movements easy and noiseless. These hardwood floor chair casters glide smoothly. Quality materials and a rock-solid construction make our 3-inch office chair the strongest in its class. Each caster can hold up to 140lb, and a set of 5 can hold up to a maximum weight of 700lb. SAFE FOR ALL FLOORS: Our style casters are made of soft polyurethane material, they are safe for all floors including hardwood, laminate, tile, carpet, vinyl plank and bamboo floors, will not scratch and stain floors. They will never scratch, smear or damage your floors. Smooth in every direction, no chair mat, they're great for the office, home, gaming and more