Replacement cartridge for the U Pods by Geek Vape, notably the Sonder U. It can hold up to 2ml in e liquid and is made for the use in tight MTL, for e liquids with a high rate of nicotine, nicotine salts and also CBD. Magnetic, it is very simple to use, and it changes when the flavours fade.
Two possibilities are available for the coil of your U cartridge :