Each shade of mouth blown glass is unique.
Base weight: Concrete, Polyethylene plastic
Base plate/ Tube/ Shade holder: Steel
Use an opal light bulb if you have an ordinary lamp shade or lamp and want an even, diffused distribution of light.
Use a clear light bulb if you have a lamp shade or lamp with a perforated or cut-out pattern or other airy, open design and want the pattern to cast effects on the wall and ceiling.