The Suorin pods systems are very easy to use and simple to replace. This system comes with a refillable pod. These pod systems can be used with Nic-salt e-liquids, freebase eliquids and nicotine- free e-liquids. If you are a vaper that makes DIY e-juices these pod systems can also be used with 60/40 VG/PG and 70/30 VG/PG e-juices as well. The Suorin drop comes with a 2mL juice capacity pod. The Suorin Air pod system is also very easy to use and replace. This pod system is easily refillable. It has a plug sealed cartridge. This system features a 2mL pod for juice.