Set of 6,Material:thick Glass;Size :diameter:20mm/0.79 inch;height:72mm/2.83inch,Capacity:6ml;Bottle Color:Transparent | Brand new and high quality,Corrosion-resistant glass bottle, practical and durable steel ball. | Cool smooth rolling Metal balls for even oil application,no more rollers getting stuck or falling out. | Small volume, Compact,light weight,Perfect for travel, easy to carry, refillable, secure and convenient. | Perfect for loading various oil, like compound essential oils, vegetable oils,essence, perfume, massage oils etc.