Four replacement ceramic chambers for the VOLTA electric hookah heater. The ceramic chamber is the bowl you pack with shisha; it seats between VOLTA's top and side heaters so heat reaches the tobacco evenly from both directions. The design follows the phunnel principle, so a standard fluff pack works and juices stay in the well. Every VOLTA ships with two chambers. This 4-pack is rotation stock: swap in a fresh chamber as residue builds so heat transfer stays consistent. Home users cycle a set over weeks; lounges go through them faster.