The Calibr Pro has an upgraded mouthpiece compared to it's predecessor causing an all around better experience. It uses iKrusher's "oil to coil" design to maximize oil consumption so that you can get every bit of oil vaporized without losing any. The Calibr Pro also has 4 airflow holes and a ceramic coil to maximize the flavor of your oils. It also has a wider mouthpiece so it is easier to puff through and also feels better on your lips.