To refill just unscrew the replaceable mouth piece and pour in your favorite product. The high quality of this product ensures the user that there will be no leaking or mess. Because these cartridges feature 510 threading, they are compatible with any 510 threaded battery, for easy cross-compatibility.
For reasons I don’t entirely understand, I received a gold version with “mariocarts” laser etched on the side of it. 10/10 worth it for how hard I laughed when I opened the parcel.