LPKF has a patent in Europe for this pneumatic frame, they are not allowed to sell it here as it's direct copy(ZelFlex Z4P).
If somebody still buys it, it's very hard to repair it, when it fails(and rubber tube inside will fail after a few years), you need to have the right tools to make it airtight(rings, bending tool and handpress), you need to have the right softness of air tube, etc.
Mechanical frame will hardly fail.
Roughly the frame is 300x400 mm in dimensions, it will fit all the printers for framed stencils, if they are open on sides. I'll update the listing with more technical details.
Currently we have a promotion for a free stencil, if you buy it.