The Voopoo Pod-S1 refillable and replaceable cartridges are specifically designed for the all-new Drag Nano Pod Kit and Zip Pod Kit. The Voopoo Drag Nano is the latest pod system offering an aesthetically pleasing compact design and premium functionally we come to expect from salt nic devices. The Pod-S1 Cartridges are compact pods that feature a 1ml pod capacity, easy top-fill mechanism, and a 1.8ohm coil resistance level. Easily refill the Voopoo Pod-S1 via top fill. Simply, pull out the pod from the device, detach the mouthpiece portion of the pod to reveal fill ports, and insert nozzle to fill. These pods were made to be used with salt nicotine e-liquids only.