Caswell has nice wheels.

I have a couple different types. One is a 4" diameter, by a 1/2" width. This is a good wheel in my opinion. The gentlemen who runs Caswell in Ontario, Canada sent me some 4" wheels that are 1" wide on my first order, as he didn't have any of the 1/2" in stock. These are the ones I love. They are about $1 more per wheel, and are just great to work with.

I also have the 6" diameter spiral sewn, at 1" wide. I like them a lot too.