Superior Quality:Our unique process upgrades the quality of the glass making the bottle thicker, smoother, and shock-proof. Our essential oil roller bottles are made of high-quality amber glass, and come with UV protection to prevent your oils from losing potency and freshness due to light exposure. Leak Proof Design:The thread design of the glass roller bottle mouth allows the bottle cap to fit tightly to it. Equipped with a well-made, corrosion-resistant stainless steel roller ball on the top, which fits tightly and prevents any type of leakage. Stainless Steel Roller Balls:The difference with other roller bottles is that our roller balls are made of Stainless Steel, which provides a smooth and even application, making them easy to use and providing long-lasting effects, and would help you to relax during salon or aromatherapy. Portable and Convenient:Capacity:10ml, Bottle Size: 0.77 in 3.33in. Our roller bottles for oils are so mini that you can easy to carry with wherever you go, making them perfect for use at home, go out, work, or on the go. The roller bottles allow you to store essential oil, essence, perfume, or any other liquids that meet your needs of daily care. Super-Value Kits:The whole set comes with 6 packs of 10ml amber roller bottles for essential oils with caps, plus extra 1 dropper. I hope they will be a good helper in your life!