Upgrade your shopping cart with these high-quality polyurethane caster wheels. Made with durable materials and a load capacity of 1000 pounds, these 4-inch wheels are designed to withstand most chemicals, solvents, acids, and oils. Featuring double ball bearings and a stable roller wheel structure, they run smoothly and quietly, saving you time and effort. The stem mount design with included bolts makes for easy installation on various carts, trucks, and trolleys. With a 360-degree rotation, they're perfect for indoor and outdoor use. Say goodbye to annoying noise and jamming with these reliable caster wheels.