Aluminium on synthetic core. 3 tensions, ball end.
1 out of 2 found the following review helpful
Pros: Very difficult to find a good long-lasting A which keeps its tuning for any length of time. Once it's on, it's there for a good while.
Cons: There have been occasions when it stared to unwind about two inches from the nut but this was only after a long period of playing.