New and replacement wheels for shopping carts or grocery cart wheels for interior and exterior applications. Dark blue polyurethane tread, non marring wheels will not scuff or leave marks. Rear shopping cart casters feature zinc plating for preventing corrosion, and have sealed, hardened, heat treated raceways and yoke assemblies. Sealed shopping cart wheel bearings for enhanced protection from dust, dirt, and weather. Most caster and wheel orders placed by 3 PM EST ship same day!