The Westinghouse Christmas Light Bulbs C-7 1/2 D18 Replacement Multicolor Box Of 5 are vintage bulbs designed for indoor use during the Christmas season. Made of mixed materials and featuring a multicolor design, these electric-powered bulbs come in a classic C7 1/2 bulb shape. Manufactured by Westinghouse in the United States, this original set of 5 bulbs is a perfect addition for collectors or anyone looking to add a touch of nostalgia to their holiday decor. not tested