S.O.S improves the intonation at each fret and easy installation to your instruments.
You only insert the S.O.S next to the nut between the fingerboard and the strings.
It is designed and based on MTS theory (Patent no. 4383272) and made in Japan.
for soprano ukulele (nylon string), fitting scale : 340-350mm
for soprano ukulele (nylgut), fitting scale : 340-350mm