Piranha Boro Thermal Bubble Carb Cap - Green A directional carb cap perfect to top off your quartz banger! About Piranha Piranha sells more than just quartz products, we sell a high-quality experience with a low price point. Our line of silicone containers, mats, and storage for the concentrate market are always evolving. And we have over 50 different options in grinders that will last a lifetime... guaranteed! Check out the rest of our site to elevate your smoke.