PLANT THERAPY QUALITY: Plant Therapy only provides the very best when it comes to their products. CONVENIENT PACKAGING: Our Amber Glass Roll-On Bottles Pack of 4 come with (4) 10 ml roll-on glass bottles, plastic insert, metal roller ball, and lid. KEEP YOUR OILS PROTECTED: The amber glass helps protect and preserve your oils from outside elements and damaging sunlight, making them last longer. EASY TO USE: Dilute the Plant Therapy essential oil of your choice with your favorite Plant Therapy carrier oil. Add to the bottle, insert the roller ball and you are ready to go! COMPACT & LIGHTWEIGHT: Compact and lightweight making it easy to take your roll-ons everywhere you go!