what material is 10-326 made of?

A handy person from calif says:
June 20, 2014
I am not sure on your webpage how you distinguish metallic content on part numbers like 10-326. Is that one chrome, or aluminum or galvanized (since I saw all 3 words used on 36-sweep-drip/pd/Lavatory-Replacement-Hardware/10-326). I don't want electrolysis occurring, and so I want aluminum. Thanks.
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Paul from SWISCO responded:
June 23, 2014
Thanks for posting. The metal portion of our 10-326 is made of aluminum.
36" Shower Sweep With Drip Rail
36" Shower Sweep With Drip Rail
10-326
$26.20
SWISCO Shower Drip Rail with Sweep
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