Fits for 1-KEA Chairs and Easy Installation: Fitted with 1-KEA models. You can simply pull out the old wheels and snap in the new ones by hand—no tools, no hassle. The whole process takes just seconds, making it the perfect DIY upgrade for any home or office chair Seamless and Quiet Mobility: Engineered with precision ball bearings and soft, sound-dampening materials, these office chair wheels ensure ultra-smooth, noise-free rolling. Whether you're working late at night or in a shared workspace, enjoy uninterrupted movement without squeaking or rattling Robust and Reliable Support: Built with heavy-duty carbon steel frames, dual-sealed bearings, and high-resilience polyurethane, each caster supports up to 650 lbs. Designed for long-lasting performance, they maintain balance and structure even under frequent use or heavier seating. Floor-Friendly Design, No Mat Needed: Encased in an extra-thick layer of non-marking soft polyurethane, the wheels glide safely over wood, laminate, vinyl, tile, and carpeted floors. Say goodbye to scuffs, scratches, or the need for bulky chair mats—your floors stay protected at all times Worry-Free Quality Backed by COSYLAND: Every set undergoes strict quality checks before shipping. With COSYLAND’s 30-day hassle-free return policy and a 12-month warranty, you can upgrade your chair with full confidence and zero risk