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www.sunray-inc.com I've been using their urethane contact wheels. Personally, I like the urethane wheels better than rubber contact wheels. They have proven to be more durable than rubber wheels of the same durometer. The only thing you need to be aware of with SunRay is that they ARE NOT knifemakers, nor do they know anything about what we as knifemakers expect in a contact wheel. You must be detailed and very specific about the contact wheel(s) you order...if you don't specify every detail you want....you won't get it.
SunRay is strictly a custom urethane contact wheel maker, which means they do not keep stock on hand, and when ordering from them, expect to wait for your order to be produced. Most of the time orders require a 3-6 weeks wait before I receive them. (if you contact them and ask, they will send you a small bead chain with samples of the various durometers they offer.) I normally purchase 70 durometer for knifemaking applications.