The Top Shelf is a blend of our Charmer and Charm nail. The combination of the two is simply stunning. From top to bottom, 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 (shelf ) 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. Below the membrane, we transition to the Charms bucket wall weight thickness of 2.5mm, the heart of the nail. The thicker wall weight has noticeably greater heat retention, enabling you to take your rip for an extended period of time.