A carb cap is a small accessory used in dabbing, a method of consuming concentrated cannabis extracts. It is placed over the nail or banger after the concentrate is heated and applied. The cap helps to trap heat and vapor, allowing for more efficient consumption and enhancing the flavor of the vapor. By restricting airflow, a carb cap creates a vacuum effect that helps to vaporize the concentrate at lower temperatures. This can lead to a smoother experience and preserve the terpenes, which are responsible for the aroma and taste of the cannabis.