Top Quartz Bangers create an air tight seal when using a rounded carb cap, like a bubble carb cap for example. This airtight seal provided by a beveled top is perfect when you'd want to redirect airflow on the inside of your banger. Directional airflow is important when dabbing, increased airflow from you carb cap is ideal for spinning terp pearls.. through your melted concentrates, to prevent hot spots, pooling, and to increase vaporization rate