On the Arri III, the mags sit at a perfect 90 degree angle to the body.
They each weigh 1.5Kg, and can run up to 130 FPS in forward only.
See images of my actual mags below. The camera body is being sold separately - unless someone wants to buy as a package.
New, these mags list for $4250 USD ($12,750 total). I have had all three of my mags upgraded by SL Cine with the newest parts right after I purchased them 3 years ago from another owner in LA. I'm asking $7,000 US for them, or best offer. I had a new flight case custom made for them by Engineered Case Manufacturing, which I am including with the sale.
Please contact me at benning "at" interlog.com (be aware I use a spam filter that will auto send a confirmation email to you - you must enter the code or else I will not get your message).