Rotosound Nickel Plated Steel SwingBass 66 are like a Turquoise Blue. Not sure if they can fade to silver gray like that...
Rotosound Solobass 55's are Green.
Rotosound Nickel on the left:
I do see some unsilked strings on there, Rotosound RotoBass strings have no silk on them hence the lower cost.
I have not seen any Rotosounds that I am aware of with White/Grey silk...