The Feather Pod is a refillable 2ml pod designed specifically for the KandyPens Feather. To refill the Feather Pod, simply unplug the rubber cap on the bottom of the cartridge. You can fill with your preferred nic salt as well as standard ejuice.The Feather Pod attaches via convenient magnetic connection. Simply inhale from the mouthpiece to activate the KandyPens Feather's heating system. This one-pack pod is only compatible with the KandyPens Feather.