The Top shelf has a 20mm quartz bucket bucket with a wall weight thickness of 2mm; the same as the Charmer. We have distributed the responsibilities of the membrane here for the purpose of containing our terps in the hot pocket of the nail. The membrane of the Top Shelf sits at ~8-10mm above the top of the dish, keeping your terp pearls spinning freely below the membrane.
Includes Cap and Pearl.
*10mm Male 90 is pictured