3mm black rubber cord on 16" necklace with sterling silver ends and lobster clasp. A convenient, premade alternative to cut cord. To string beads directly onto these necklaces, use beads with hole approx. 4mm or larger. To hang beads and charms, use bails, jump or split rings, or wire-wrapping. Works well for men's jewelry. Beads and pendants stand out well on basic black.