Made from durable borosilicate glass, these Red Color Front Single Flare Glass Plugs are a great addition to your plug/tunnel collection. Sold in pairs and featuring single flares, they provide a comfortable and customizable fit with the ability to adjust the wearable size using the included "O" rings. Available in sizes ranging from 16G (1.2mm) to 1/2" (12mm), these plugs are a stylish and practical addition!