These carb caps are clear 2 Hole spinner bubble caps, hand made by Zombie Hand Studios in Tucson, AZ. Producing high quality glass since 2005.
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Carb caps are accessories used for dabbing concentrates. They cover the nail on a dab rig to create a sealed environment that allows the concentrate to vaporize at a lower temperature, resulting in a smoother smoke. They may also have a small hole to control airflow. Carb caps come in different sizes and are popular among dabbing enthusiasts.