Straight Barbell Sizing Guide: Gauge, Length & Thread
Gauge: nearly everything on this page is 14G (1.6mm), the standard for tongue, nipple and industrial piercings. Length is the bar between the balls, not including them: tongue bars are 5/8 inch once the swelling is gone (the longer healing bar should be downsized, for the sake of your gums and teeth), nipple bars run 1/2 to 3/4 inch with 9/16 the most common, and industrial bars span 1 1/2 inch (38mm) as standard with 1 1/4 and 1 9/16 for other spacing. Read gauge and length off the bar you wear now; both are on every product page.
Thread: most bars are externally threaded, so the balls swap with our replacement balls of the same gauge. Internally threaded and threadless bars pass a smooth post through the piercing and are the better choice for the tongue and for anything still settling; threadless ends pull straight off and press straight on, never twisted. Keep balls tight with dry threads and a weekly check, and never click a tongue bar against your teeth.
Metal: 316L surgical steel is the everyday standard, with a trace of nickel locked in the alloy that most people never notice; gold-tone and black bars are PVD finishes and colored metal bars are anodized titanium, named in the title. Solid 14k gold bars are gold all the way through, made to order and priced as gold. Acrylic balls on a steel bar are the gentle choice for a tongue barbell. Buy-one-get-two offers apply here as everywhere, except to 14k gold.
Straight barbells by piercing, and the bars that bend: