The Diamond Silicone Spinner Carb cap by White Rhino is a 3 in 1 terp pearls with spinning carb cap and storage container for concentrates. Under the lid is a silicone jar to store wax; on the other side is a 6mm terp ball storage. A silicone carb cap on the bottom that can spin terp pearls in a banger. What is a carb cap? A carb cap works with bangers; it acts as a cap on top of the banger that restricts the airflow. Certain bangers can limit and force the airflow in a specific direction. Carb caps are also great for low-temperature dabbing as they restrict the airflow, which lowers the temperature required to vaporize the concentrate, all while preserving the flavor.