Gut string,  aluminium wound, knot end, available in the gauges:

Gut string,  silver wound, knot end, STIFF version.

Steel string, ball or loop. Medium only.

Gut string,  aluminium wound, ball end.

Steel string, aluminium wound, ball or loop, in medium and heavy ball or loop.

Gut string,  aluminium wound, knot end, STIFF version. Available in the gauges: