TOPWEL 20pcs 3 Ml Refillable Amber Glass Roller Bottles with Balls and Golden Caps Capacity: 3.0 milliliters Size: 15mm x 39 mm (0.6 x 1.5 in.) Roll on Bottles with Balls and Golden Caps Perfect for storing perfume oils or other liquids Perfect for applying diluted essential oils and blends directly to the skin.