These Sweetgrass Pendants are made in the USA of handcrafted glass using a process patented to this manufacturer. The remarkable three-dimensional effect can be ordered in a variety of glass colors. All their products are UL certified and 120 Volts. This light can be used with a medium base bulb (not included): Incandescent, Fluorescent or LED. Naturally occurring air bubbles, inclusions, textures and slight color variations demonstrate that your Sweetgrass Pendant Light is an original work of art. Your Sweetgrass Pendant is made of hand-forged iron and comes with 2-year limited warranty. If your hardware or glass shade arrives defective in any way, please contact your retailer for claim instructions. This glass exudes romantic ambiance with color. These glasses have a rich waxy feel and stone-like texture and appearance. These glasses are more luminous, richer in color and eliminate unsightly light bulb hot spots. They hold the patent on her technique. And, because the color is inside the glass and not painted on the surface, there is a remarkable 3-dimensional effect while light is diffused throughout the glass. The complex mixture of colors is difficult to attain in glass. This glass surpasses any other for lighting, even that which Louis C. Tiffany made and became famous for from 1878-1938.