B50 and B55 ??

[matts2]

I was putting a flemish string together last night and while i was in the twist groove I realized that the thickness of my two bundles weren't right.  They both had the same amount of strands, but one seemed noticeably thicker.  I then realized that i had both B50 and B55.  Never paid much attention and don't know how i got the B55, but I have a couple spools of it.  Whats the difference and can they be twisted together?

[JRY309]

B55 has less stretch then B50,I don't like mixing strings in a bundle that don't have the same quality.JMO