Sterling silver chain, light and airy with links large enough to receive a hook.  This means you can adjust these chains to any length, so buy one that is the maximum length you think you might like to wear it.  16" base price.  Remember that extra chain will hang down your back, which can be cute unless it's 6" long, then you may find it annoying and strange-looking, so consider this in your purchasing choice.  If I don't offer then length you want, message me.  Cost is a dollar an inch.