For 2 years i have tried so many brand names,, One of the top ones was the---'Most Pure'--but the odour strength was way to weak. These are very high quality and 100% pure,, imported to Australia from America. No additives or added dilution carrier oils and the odour strength is the most pure and--'Distinct In Each Selection',, and very strong perfect odour that even stays in the room even when diffuser has ran out of water and cut out. Even though the odour strength is very strong they are not-----'Overbearing'. 100% RECOMMEND THESE AS THE BEST OILS AVAILABLE.