So I've been seeing that some pipes have a rubber tip end. I looked at these on line and it seems there's is just one size. Do these stretch over or are they heat shrink? I ask this because from my limited knowledge as a newbie, the stem tips seem to be different size/diameters and I don't want to order some if they're going to be too big or too small.
Thx
Tb
Thx
Tb