Twisted Triple Silk / Satin Cord 20" + 2" Ext Chain - Dark Red (D3) Made of three strands of shiny silk/satin cord twisted together to form a thicker braid-like cord.. Necklace itself measures 20" long and 3.5mm (or 3/16") in diameter.. 2" extension chain allows for greater versatility.. Perfect to hang your favorite pendants on..