Its way too important to have dark bottles for usage and storage of precious oils. It protects their integrity. Its a must so that they keep their potency and true scent. Just the right size to fit onto my pocket or slip into my purse. Fits well into my hand and is easy to operate. The roller ball in this slides smooth and clean and gives an even distribution of oils when applied. Be it neck or bottoms of feet that have a curved surface it did not matter. The caps screw on tight so they do not leak and the bottle itself has a matte finish so the bottle cant slip through my hand. The threads on the bottle cap are machined nice and even so I get an even screw on and off every time. Do not keep the bottle when full in direct sunlight or leave for prolonged periods in high heat. This will ruin the oils inside and make them stale. I love these and they make it so easy to mix what I need and be mobile with it. They are very pretty as cobalt blue is my favorite color which makes the contents even that more inviting. I recommend these 100% I picked this off of a list of things needing a review at a discounted rate or free and gave my unbiased honest opinion.
Post time: May-26-2017