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: 5.0"
Width: 2.0" (approx)
Axle Hole Diameter: 5/32"

Comments

Replacement Air Valve (DUBQ0809)