Discover these 4-in. caster wheels, made of high-quality polyurethane on cast iron wheels. Each wheel can support up to 500 lbs. and a set of 4 has a combined load capacity of 2000 lbs. The polyurethane material offers excellent abrasion and corrosion resistance, long-term durability, and strong shock absorption. These wheels roll smoothly on various surfaces, reducing vibration and noise, which helps protect your equipment and floors. They are suitable for a wide range of applications, both indoor and outdoor, such as in garages, workshops, kitchens, and offices. Whether it's trolleys, workbenches, toolboxes, or furniture, these caster wheels will make moving items much easier, bringing convenience to your daily life. Color: Blacks.