Chrome wound steel. The original Jargar string.
Chromesteel on steel 3 tensions Made in Denmark
Good quality strings at a reasonable price.
Pros: Smooth sound, settles quickly and needs virtually no 'playing in', good for developing cheaper instruments or those which haven't been played for some time. Not affected by temperature or humidity.
Cons: For some instruments Jargar will be too hard, although the soft grade does give a slightly 'stringier' sound. The E string can be shrill - personally I prefer a wound E string.
Other: I have used Jargar violin and viola strings for many years and never been dissatisfied.