I admit I am not the "chemist" of the household and I bought this upon a request of my wife who literally loves them.
She told me that she can smell that there are no chemicals in these oils and she really love their quality and pureness.
They smell great and they come with a very handy book that not only allowed me to understand what essential oils are about and how to use them. Each bottle has its own description in the book, along with many recipes.

These oils are amazing and 100% pure. I've been using different ones from years now, and i'm pretty impressed of the quality of this set - also the gift box it's nice and sturdy. Being highly concentrated, a little goes a long way! I love to use the lavender to relax and the eucaliptus for colds and sinusitis. Great introduction gift box for beginners, I'm gonna get one for mum for her birthday! Cheers!