My TL-71's look like the OP's (note: I wouldn't swear that mine are genuine, but I believe they are)
They do not bend easily - with a significant pressure I can get them to flex maybe a couple mm. The small flex returns to straight as soon as the pressure is released. I'd call them stiff.
They are definitely silicone, not PVC. The wires are not marked though.
The handles have "FLUKE" on one side and on the other:
1000V CAT III
10A
600V CAT IV
I've posted some detail pics including (just the red is in the detail pics - black has the same markings but is less visible):
- markings on the red or black "inserts" on the probe handles: a triangle with "!" inside (general attention/warning) and two concentric squares (double insulated).
- detail on the banana plug boot: "TL71"
I don't know if the OP got a genuine article that shouldn't have passed QC, a genuine article that indicates Fluke is lowing standards (or maybe it's supposed to be an improvement?), or if they are counterfeits.
As I mentioned, I believe mine are genuine, but I don't really know. I can't remember where I got them, but almost certainly eBay or Amazon.