Hide Your Piercing 16ga Labret Retainer. Now you can retain your labret piercing with this Labret retainer. Made of 14 gauge durable acrylic this invisible body jewelry just slides right in to your labret piercing and is held in place with an o-ring. You can keep your labret pierced and nobody will know. Use it for work when your boss is a jerk, use it at family get togethers or for an MRI exam.