So good pods are JUUL compatible refillable pods. Instead of buying 4 of the same flavors for a higher price, you can customize your vaping experience! There are four rubber tops in four different colors to differentiate between your flavors. Each pod holds 1 ml of juice. The pods hold salt nic, regular e-juice, and even liquid concentrates. The filling process is easy and mess-free. Simply remove the black top piece, and under that you will find the plastic clear piece that covers the holes. Remove that small clear piece (be careful not to lose it!) and reveal and filling holes. There are two, one on each side of the center wick. Put your juice in either side, being careful to not get juice in the center or on the outside. Replace the clear piece and black mouthpiece. Let the pod sit for about 3-5 minutes to let the juice soak into the organic cotton. After that, remove the rubber colored bottom, hook up to your JUUL, and start vaping!