Exo concentrate is a French range of flavour concentrate created by Revolute (Laboratoire Cosmer) for DIY e-liquid, in the fruit family: pineapple with tropical fruit, guava and watermelon, mango and coconut. It contains neither sucralose nor koolada. It is diluted at 7% in a 50/50 base, then left to steep for about fifteen days. Made in France. Bottle size: 10 ml. Recommended dilution: 7%.