Holysmoke Shake & Vape 15ml and 30ml flavour concentrates pre filled in 60ml and 120ml bottles. You can choose between our Sweets, Drinks, Fruits, Cool, Tobacco & Original selections. The 60ml bottle is pre filled with 15ml flavour concentrate and the 120ml bottle with 30ml flavour concentrate, the remaining needs to be filled with our nicotine booster shots. Before adding your nicotine calculate your VG/PG ratio. Once your boosters have been added for your desired nicotine, then top up with no nicotine base liquid either VG or PG depending on your desired ratio. We have added a chart here to guide you for the desired nicotine and VG/PG ratios.