There are two types of prongs for a Double Nose Ring: L-shape and twist-shape. The L-shape prong is shaped like an L and is inserted into the hole at a 90-degree angle. The bent end sits against the nasal passage wall and keeps the jewelry in place. The L-shape prong may cause some initial discomfort. The twist-shape prong, on the other hand, is shaped like a spiral and is inserted into the hole by twisting. This twisted shape can catch boogers and may not be the best choice for those with allergies.