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PU5x40x30ZZ Shielded Bearing - Black Polyurethane Tire 5x40x30mm Outer Diameter - 5 1/4 inch (5.25") - Pre-lubricated chrome steel bearingPU5x40x30ZZ Shielded Bearing with Black Polyurethane Tire 5x40x30mm 5mm x 40mm x 30mm VXB Bearing Black Polyurethane Ball Bearing with metal shielded, PU5x40x30ZZ Ball Bearing Material: Black Polyurethane Seals: 2 Metal Shields Size: 5mm x 40mm x 30mm Bearing Inner Diameter: 5mm Bearing Outer Diameter: 40mm Wheel Material: Polyurethane Bearing Width: 30mm Brand: VXB Bearing Quantity: One