Mamiya 645 Pro/Pro TL 220 film insert with case. It should also work with m645, 1000s and 645E models.
Perfectly functional; I recently sold my Mamiya Pro, so I no longer need this insert. I have Mamiya Sekor lenses that I'll be listing separately. update - all lenses have been sold
Typo? It will work as a 120 linsert, not 110. I've seen something on a website about it. Tried it. Works.
As I recall, the thing you have to remember is that the counter will keep counting as if it contained a roll of 220. But it starts at the correct spot for 120 film.
I've read about converting Mamiya 220 inserts to 120 functionality as well. I can't speak to it personally, as I had enough 120 backs to not need the conversion.