8x11 film format cassettes, produced and sold by Asanuma/Acmel Japan. Similar size and design to Minox cassettes. However, I do find that the Acmel cassettes are a bit more sturdy than their Minox counterparts. On the downside of it, some Acmel cassettes jammed in my cameras a couple of times in the past. I tend not to use these, unless I have no choice.
Surprisinly, or perhaps not, I have never seen any Acmel film cassette, factory loaded with BW film. No idea why, perhaps it has somethign to do with Fuji Color films being marketed by Acmel. Fuji does BW film negative too (or they used to), so why not Acmel cassettes with BW? No idea.