I make my own continuous loop strings. I was using 8125g but found it gets fuzzy quick in my experience. I’ve since started using Brownell Rhino. By far my favorite material. I find it a bit more durable and I’m experiencing less stretch.
I make Flemish strings but have traded for a couple bows that had some real nice continuous loop strings. I will probably make a jig and give it a shot one of these days.