A carb cap is an accessory to be used while dabbing. They’re a small, often overlooked accessory when it comes to dabbing, too, but they’re an absolute necessity when it comes to taking low temperature dabs. They look, well, like a cap, like the name implies of course. There are a ton of different specific designs that carb caps come in, but the basics of them remain the same. Carb caps are made from the same durable materials that nails are made of, in most cases. The most common materials are glass, titanium, and ceramic. They cover the top of the nail or banger after concentrate has been dropped in, helping to trap the residual heat of the burning substance. This trapping of heat prevents cooling off during the process, and allows the concentrate to burn more completely. An additional thing to understand about the name is where the term “carb” comes from. Carb stands for carburetor, and much like the carburetor under the hood of a car, they help to regulate airflow in a specific way. This can work in a number of ways, depending on the design of the carb cap.