Question Numbers of Strings: Cobalt Plain Strings

[jack8rkin]

Hey everyone!
I just analyzed the numbers on paper packets of various EB strings.
It turns out that in Cobalt Slinkys numbers are different for plain strings. Why so if these strings should be plain strings as in Regular/Hybrid Slinky? (At least it's what I read on this forum).
See the attached spreadsheet.

 

[DCStingray]

The plain strings in the Cobalt Slinky and Rock N Roll sets have a different number on the envelope because they use a different envelope than the plain strings in normal Slinky sets. The strings are exactly the same, but the envelope is different which is why the part number is different.