Very useful devices. Necessary to replace the worn head. I have had no need to use them, right now, but I am sure that time comes in which I will need them.
Online store: AliExpress
US $8.72 31% OFF|Original Vaporesso Renova Zero Pod with 2ml Capacity and 1.0ohm Coil Head Atomizers Vape Tank For Electronic Cigarettes zero kit-in Eletronic Cigarette Atomizer Cores from Consumer Electronics on Aliexpress.com | Alibaba Group
8.72 USD