Please help with coils

I am pretty new when it comes to prebuilt coils. I am looking for coils that feel very strong/sturdy, but I am not having the best of luck and not sure what material it is.

I had coils that said they were .25ohm and all it says is "KA1 WIRE + Ni80 wire" and they felt very sturdy/hard to pull the wraps apart etc….I am looking to find these again.

I bought what I thought were a good replacement for those, but they feel flimsy and easy to pull apart the wraps. They are .36ohm, 316l…

Please help with coils

Original source: https://www.e-cigarette-forum.com/threads/please-help-with-coils.960175/