Medium is steel and copper.

Diamond overlay for designs
designs Fitted with twenty-four porcelain medium based sockets.
Choice of patina is rust or black iron for most products unless otherwise specified.
Choice for mica is amber, or natural silver.
We do not recommend using over 40 watt bulbs for this fixture.
UL Listed for dry location.
Also included is a cover plate and mounting hardware.
This chandelier product will require a reinforced junction box for the additional weight.
Please inquire if you have any concerns or questions about the weight appropriateness of fixtures.