18-20" adjustable snake chain Calypso necklaces. 3.3mm diameter. Plated over brass. Antiqued Brass is darker than raw brass and goes well with just about any color. Perfect for Calypso beads and other beads with a hole size 4.4mm or larger. Finished with swivel clasp and 2" steel adjuster chain. If you have a bead that almost fits, try removing the end jump ring before stringing bead, then re-attach jump ring.