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If you turn off the light, this barbell glows in the dark. It's a glow-in-the-dark circular barbell made of acrylic. During the day and with natural light, this barbell looks normal; the difference is that you will see it glow when it's dark. That's why it's an excellent ring to go out to party at night. Besides, you can wear circular barbells in many different piercings, provided that you choose the correct size for yours. You can put it in your septum, eyebrow, or ear piercings, for example. 

The sizes of this circular barbell are the following: gauge of 16g (1.2 mm), a diameter of 3/8" (10 mm), and ball diameter of 5/32" (4 mm). Since it's made of acrylic, it's a very flexible ring, so it's effortless to put on and take off. As you can see, it's available in a variety of colors. Check them out and pick yours!