DIY Flavor Concentrate We suggest flavoring at a 15% Ratio to to achieve the perfect flavor balance. 15ml: 2.25ml Flavor Concentrate30ml: 4.5ml Flavor Concentrate120ml: 18ml Flavor Concentrate This is the same flavoring that we use in all of our e-juice.Warning: Use proper precaution when mixing DIY. USP kosher grade flavoring. Artificial color and Diacetyl free. No added salts or sugars.