TOPWEL 3ml Refillable Amber Glass Roller Bottles with Metal Roller Balls and Gold Plastic Lids (12) Capacity: 3.0 milliliters Size: 15mm x 39 mm (0.6 x 1.53 in.) Roll on Bottles with steel metal roller balls and gold plastic lids Perfect for storing perfume oils or other liquids Perfect for applying diluted essential oils and blends directly to the skin.