Starting with Nylgut, Aquila adds red copper powder to increase the density of the string to almost twice as much as standard white Nylgut. This results in a stiffer string capable of lower tunings, less breakage and better intonation. Filing of the nut slot may be required.

• Technical solution adopted: 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
• Color: red-brown
• Surface: slightly rough; this texture has eliminated the squeak that sometime hapPen with the Nylguts.
• Elasticity/Elongation: like the common white Nylgut!
• Performances: better than the first elastic version! They do not break under stretching. fast and stable tuning!
• Intonation: accurate past 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 like can happen with the fluorocarbon G strings
• Density: about twice than standard white Nylgut