About this product

Dabbing works by heating the nail to an extremely high heat before placing the dab on it and inhaling the vapor. Without a carb cap, the dab is out in the open—it is placed on the super-heated nail but is still exposed to the temperature of the air. This means that the part of the dab that first touches the nail is exposed to a more heat than the top layer of the dab, and the result is a harsher taste and increased irritation upon inhalation. The carb cap works like a small dome. It creates an air-restricting suction that lowers the air pressure within the cap. This makes it possible to dab at a lower temperature than you would if the concentrate was exposed to the air. Additionally, the decreased pressure causes the oil to interact with the heat in a way that naturally cools the vapor. The end-product is a more enjoyable and flavorful dab experience. - https://www.wikileaf.com/thestash/what-is-a-carb-cap/