From Veer, this wheel kit features: The kit includes 2 swivel and 2 oversized inflatable tires made of aircraft-grade aluminum and corrosion-resistant hardware, plus larger fenders to protect little fingers The heavy-duty tires can be easily inflated using the same hand or foot pump you use for bike tires or soccer balls Inflatable tires Aircraft-grade aluminum forks Corrosion-resistant hardware Wear resistant Hose washable Dimensions: Swivel wheels: 9" diameter; Large wheels: 13" diameter Capacity: Cargo/passenger weight should not exceed 110 lbs Weight: 14 lbs Imported. Returnable