I may never understand this string stuff,, the strings I got from him were 2 flemish twist dyna flight strings, which he explained to me as being the slowest but easiest on the limbs,, and he sent me a a flemish twist dacron which I thought he said was the FFF I must have misunderstood him,, now the strings colors do not match what dan explained eirlier the one might the one flemish twist dacron is silver/grey and black and the other flemish twist dyna flights are brown and black.. Iknow color does not help a lot as the material they get can come in many colors..