Fine S-Lon is halfway between Micro and Regular S-Lon at approximately 0.4 mm in diameter and a breaking strength of 25 pounds. It can fit size 11 and larger seed beads. We love it for micro macrame, kumihimo, crochet, and all kinds of knotting and stringing projects.
Super-lon by The Beadsmith is a 3-ply twisted, bonded nylon beading cord that is extremely durable and comes in a dazzling array of vibrant colors. We have used this for years and can't get enough of it!