Gauge: Bar Thickness: 14G/1.6MM; Bar Length: 16MM. Material: 316L Stainless Steel, Nickel and Lead Free! High Polish Surface, Convenient to Wear. Design: The design with a capsule on the top makes your tongue piercing more charming. These Tongue Bars First Soak up Energy for Long Periods when Exposed to Light (from a torch or the Sun) and Subsequently Radiate Visible Light in the Dark. Different Styles for You to Choose,Suitable for Many Occasions Wearing! The design with a capsule on the top makes your tongue more attractive. These tongue strips first absorb energy for a long time when exposed to light (from a flashlight or the sun), and then radiate visible light in the dark.