It's 100K.

I just had to replace mine, I went with the E3D since I was getting some other things from Prusa at the same time. It's also the first time the part has broke, so I wanted to replace it with an "original" before trying the Amazon ones. Had I bought off Amazon I would have gotten these. Don't forget foil tape and polyimide tape as well if you go this route, as I don't think the Amazon ones come with a square of either.

PS. These are probably really long cables as well.