Azoom, all aluminum. Read the reviews.
http://www.amazon.com/A-Zoom-Precision-Snap-Caps-Gauge/dp/B0029M2YWE/ref=sr_1_1?ie=UTF8&qid=1364957935&sr=8-1&keywords=azoom+12+gauge
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I tried downloading from the above link and learned (I think) that the cover is in an unknown image file format, the cover letter is GIF, and the manual itself is broken into ten-page GIF format groups, so I quit trying.
My new Model 11029 arrived OK except that all the OEM Benelli oil had leaked out of the container and soaked into the Benelli box. What should I use to lube the gun before I shoot it the first time? I use Breakfree CLP on other firearms, will that work?