This vape accessory by Hellvape is designed for and compatible with the popular Hellvape Grimm Pod System. What this allows you to do is build and install your own coil to use with this pod mod. The Hellvape RBA Kit for the Grimm Pod features a simple two post building deck.
When installing your coil, make sure each lead is facing the opposite direction. There's large wicking slots as well, but be sure not to use too much cotton as this can result in a dry hit.