Examples:
PA 6.6 2400dtx with 4 filaments = 600 dpf alligator cross section type S680
PA 6.6 2500dtx with 5 filaments =500 dpf diamond cross section type SB80
PA 6.6 3360dtx with 8 filaments =420 dpf trilobal cross section type S340
PA 6.6 5000dtx with 10 filamentd=500 dpf diamond cross section type SB40