The process of Inverse String Winding compresses the outermost part of the cover wrap leaving the internal structure of the string intact. Exclusive to S.I.T., this design produces a silky feel which is easier on your fingers and frets, but explodes with a great sound. Perfect for fret-less basses. Nickel plated steel over hex-core. • MFSKU NRL45100L • UPC 649687506025