This set of Onepure oils includes the most popular essential oils which include Tea Tree, Lavender, Eucalyptus Lemongrass, Peppermint and Sweet Orange. Each bottle contains 10ml. I use them with my favorite carrier oils sweet almond and jojoba, but there are many more to choose from for your personal touch. The carrier oils will extend the life of the essential oils. Each oil has a specific use: lavender is a light scent for relaxation, tea tree is a powerful antiseptic, lemongrass induces relaxation and helps relieve muscle pains and aches, eucalyptus is known for clearing coughs and congestion, sweet orange gives off a calming effect and clears pesky smells, and peppermint also reduced muscle pain and in my diffuser is a mood uplifter. I enjoy using my essential oils in my favorite skin moisturizers, aromatherapy diffusers, potpourris, vacuum cleaner, and hair. There’s nothing more relaxing than lavender and jojoba in my diffuser after a long day. It releases a fresh scent that clears my mind and helps me sleep. Great starter gift.