<https://www.vaporizeusa.com/products/multi-airflow-vortex-carb-cap#product>
<http://schema.org/description>
"The vortex carb cap pairs perfectly with a flat top banger and rotates the airflow as it goes in. \nThis special design spins the airflow inside the bucket and can spin a terp pearl for the best dabbing efficiency. \nMade with borosilicate glass and measures 37mm at the widest point. Fits most quarts and titanium banger nails. Available in multiple color options."
<https://www.vaporizeusa.com/products/multi-airflow-vortex-carb-cap>