I have been using 8190 on a few of my bows,it is a small diameter per strand.I have used 12 strands of 8190 on my bows upto 55#.A 12 strand 8190 is about the same diameter as 10 strand 8125 and 8 strand D97.I find it a great string material,makes a quiet bow string.I will go to BCY-X when I run out of the 8190 I have now.They are the same SK 90 but the BCY-X has a blend of 17% Vectran,other then that they the same material.The blend of Vectran makes it even a better bowstring!And I do pad my loop ends to about 20 to 22 strands in the loop ends depending on which bow I'm making a string for.