They are actually polyurethane. However, they are very sturdy and carry loads quite well.
By Isabel Stowe
As far as I can tell the tires are rubber and the wheel are polyurethane (not metal) they work great on my wood cart and I never have a flat.
By Gustave Chesterton
solid something rubber
By May Wilde
Very, very shiny, unlike rubber would be Good morning
By Julian Buckle
I'm no chemist, but I believe it is polyurethane, a chemical compound like rubber. They work well on my cart.
By Samantha Toby
