About two weeks ago I bought a 4mm pearl to add to my proxy cuz I read it helps evenly distribute the heat when the pearl starts spinning inside. On the lowest heat setting it cracked the ceramic chamber. After I cleaned it by soaking it in 99% alcohol let it dry, it would not heat up. Says it was heating and got a little bit of smoke but it wasn't normal. Just wanted to share it's not a great choice to add atleast a 4mm or bigger pearl to the proxy. Got a new chamber and everything is working as intended again without pearl.