I have found this electrical tape in several of my switch boxes.  It appears that -- instead of wire nuts or wall nuts -- the wires have been twisted, soldered a bit, and wrapped in this odd tape.  The under layers around the conductors are a sticky, rubber consistency, while the outer layer is a cloth-type (like hockey tape for those familiar).

My house was built in 1955, and I have already found some shoddy electrical work elsewhere so I have some trepidation about this stuff.  Can anyone identify it?  Is it still safe/up to code in the US?

[![enter image description here][1]][1]

**EDIT:** Found [one reference][2] to it in the EE SE.  One of the comments suggests that the stuff can be dangerous if it dries out.


  [1]: https://i.sstatic.net/hJLnF.jpg
  [2]: https://electronics.stackexchange.com/a/244371/122929