Aquila Red Series Tenor Ukulele String Set Normal GCEA Tuning, 87U tonationpast the 12th fret.Pressing strongly the string on the frets, the note does not became sharper.It is not necessary to file the nut slot wider to accommodate it. Set / Tenor Ukulele 4-string g' c' e' a' - Regular Tuning, Key of C All strings made of a mixture of NYLGUT andred copper powder Colour: red-brown Red Series - Nylgut made firstly elastic and then added with red copper powder in order to increase the density to about twice that of standard white Nylgut.Slightly rough surface; this texture has eliminated the squeak that sometime happen with the Nylguts.The new red-brown strings feature a great feel, excellent elasticity andaccurate in