This 13 x 4 replacement wheel is made of PU foam, making it lightweight and puncture-proof. It features a solid design with a plastic center and a 35mm bore, supplied with reducing bushes to fit a 20mm bore. Ideal for wheelbarrows, launching trolleys, carts, and sack trucks. The wheel has a diameter of 13 inches (330 mm) and a width of 4 inches (100 mm), with a wheel center hub of 6 inches (152.4 mm). These tires are non-marking and offer the feel of pneumatic tires without the risk of flats, ensuring reliable performance in tough conditions. Not suitable for highway use.