These are Inflatable Big Wheels by Du-Bro.

Features

Realistic Bolt-Together Hubs
Smooth Inflatable Tires
Positive Seal Air Valve

Includes

Two Wheels
Two Wheel Covers
Two Collars
Two Wheel Cover Screws
One Air Valve

Requires

Air Pump

Specifications

Diameter: 4.5"
Width: 1.7"

Comments

Replacement Air Valve (DUBQ0809)