Grayling's line of flat back earrings are called labret stud in the piercing world. You may use this style of piercing jewelry in several piercings beyond your earlobes.
Most commonly this style of jewelry is used in the nostrils, lip piercings including philtrum and both central and side labret, ear lobes and ear cartilage piercings such as the helix, conch, and tragus.
Please note depending on the location of your piercing and your anatomy, you may need a different post length and gauge. You can learn more about what size flat back post you need in this article.
This style of piercing jewelry does not work for navel, eyebrow, ashley, smiley, nipple, septum, daith, or snug piercing. These types of piercings require a curved bar. Please contact a professional piercer if you are unsure what type of jewelry is best suitable for your piercing.