No, that's Acavallo Operas, quite different. And then there's Ophenas...again very different (magnetic). @webble seems to have found them. I presume the part below the foot is something to do with the shock absorption, can't see how the safety mechanism works.Was it Opera or something like that? Safety stirrups.
Aha! That’s them thanks they’re very curious looking
- It is an unusual shape! What is the part under the tread for?
To ensure the safety of the rider with a single-piece polymer branch, an insert (reinforcement) needs to be embedded in it. Our studies in material strength show that the shape of the insert plays a major role and it’s essential to avoid corners which create real points of weakness. For this reason, we have developed and patented a stainless steel insert with this particular "C" shaped line that acts as a flexible arc without any weak points, making it unbreakable. In addition to its high resistance to stress, the insert provides maximum support from the tread to its tip, where the stress is felt most.