Beading Thread comparison from smallest to largest: O (super fine, 0.15mm), A, B (0.2mm), 1G, C, D (0.3mm), E, EE, 1, 2 (0.45mm), 3, #18 (0.5mm) 4, 6 (0.70mm), F, FF, 5 and 8.
The first couple Fireline items below are .005" (.12mm), a tiny bit thinner than traditional super-fine O! It's "super duper fine" -- perfect for beadweaving complex patterns with tiny seed beads.
The items on this page are currently organized by size (thinnest at top). We're working on improved filters for this page too. In the meantime, click into any item below for more details, or see the main Chain & Cord page for more information about a wide variety of cording and finishing methods.