Go to siroller.com. They make good rollers. I’ve been using them, and almost all the rollers in Printers’ Hall are SI. They’ll be as reasonable as anyone on high quality rubber rollers. We certainly do not recommend using composition rollers. They are hygroscopic, and do not last nearly as long. That’s great if you’re a purist, but the cost of rollers forces me to be pragmatic. Having the old cores will save you a lot. You’ll just send them in to SI. If they are old and don’t have center holes in the ends, it’ll be slightly more because the rollers are ground after being cast. Hope this helps.
Chuck Wendel