Transform your office chair mobility with these premium rubber caster wheels designed for both hardwood floors and carpet. Each wheel in this set of 5 features a robust 3-inch diameter design and supports up to 650 lbs total weight capacity. The universal stem size (7/16" x 7/8") fits 98% of office chairs, though note they're not compatible with 1KEA chairs. Installation is a breeze - simply pull out your old casters and push in the new ones, no tools required, taking less than 5 minutes. These heavy-duty replacement wheels roll smoothly and quietly, protecting your floors while providing superior maneuverability. The sleek black design complements any office chair style, and the durable construction ensures long-lasting performance. Before purchasing, measure your chair's existing caster stem using the provided guide to ensure proper fit. These wheels eliminate the need for chair mats while offering enhanced durability and floor protection.