This new feature helps seal the connection between your banger and your cap. The beveled edge creates a natural curve for your cap to sit more flush on the banger.
The reason this is important is because the better connection you have, the more pressure that is inside the quartz banger.
When there is more pressure, you can use your products at a lower temp!
(Notice how once you put your cap on, there is more vapor than before? What is happening is the cap is lowering the pressure inside the banger!)
At the end of the day, this banger will allow you to take lower temp dabs but still receive the same amount of vapor.