TFA flavour concentrates are Naturally and Artificially Flavoured. Made in the USA by The Perfumers Apprentice& Rebottled by Vapour Depot in the UK. Available Sizes: 10ml, 30ml, 100ml Recommended Mix (Single Flavour): 2% Recommended Mix (Multiple Flavour Recipe):1% Requires mixing with Vegetable Glycerin & Propylene Glycol before can be vaped. TFA Smooth Concentrated Flavouring A large range of flavours for use in various applications such as: Baking, Candy-Making, Carbonated water (soda flavors), and many other applications that have fun with flavors!. A flavor smoothener that is useful to use in concert with other flavors- \"Smooth\" will round out any harsh edges and provide a thick, satisfying mouthfeel. It will soften the high notes of your blend while boosting your background notes.