Our glass roll-on bottles are fantastic for applying essential oils, fragrance oils, perfumes or any other liquid products to the skin – simply roll on as needed. Each comes with the empty bottle, roller ball, housing, and cap. After putting the liquids in the bottle, insert the plastic housing into the opening, pop the roller ball into the housing, and screw on the cap. Each bottle capacity is 0.35 oz. and measures approximately 2 3/4” x 3/4”.