Sorry for the rookie question but how can you tell the difference between a fast flight string and say a B50?

Thanks

If it is a flemish splice string, pull one of the tag ends out (where the ends of the bundles are blended back into the string) and try to cut is with a pair of scissors.  B-50 will cut easily and FF will take several trys to get it to cut.  Might be better ways, but the only one I have found so far.

Thanks, it worked.  The string in question cut easily.  A sting that I know is FF didn't.

Glad to be of help.