A directional carb cap allows for air to flow through as you take your hit. While the rest of the carb cap fulfills the required duty of maintaining heat control, the airflow helps to move around your concentrate in order to more effectively get the most out of your hit!
Low-temperature concentrates run the risk of waste. If the induction cap is not heated enough, OR you are trying to purposely take a low-temp dab, then utilizing a carb cap cuts down on the amount of concentrate that is still left over.
Naturally, we need to heat up our banger or induction cap in order to take a nice fat dab. Unfortunately, if you heat up your cap or banger too high, you run the risk of spackling hot concentrate in your mouth. If you dab it too cold (without a carb cap) you will not get the most out of your dab and it will end up sitting there until you reheat it.
With a carb cap, you can take a low temperature hit while maintaining the heat for longer periods. The heat dissipates through the top of the cap if you put something over it, you will trap that heat more effectively. Thu, creating a longer burn period for your concentrates!
The directional bubble cap is used for clearing out your concentrate in one long pull. When your Alpha is heated to the right temperature, simply place your concentrate in the ceramic or titanium cap and place the bubble cap (short side down) into your titanium or ceramic cap so that air can move through it freely.