These pods are designed to be used with the GeekVape Wenax H1 kit. The pods have a leak guard system which protects from leakage. They also fit easily to the top of the device and have built in coils to prevent the need for messy coil changes. The liquid level is clear from any angle, so users know when it is time to refill. To top up the pod remove it from the kit and take out the silicone plug. Insert the vape juice, push the plug back in place and reattach the pod.