The Thomastik-Infeld Spirit! violin string is based on a synthetic core (A-D-G) with aluminum (A-D) and silver windings (G) respectively. For smaller sizes (1/4 -1/2) a monel winding is used for the D string. According to the manufacturer, the strings have an easy response; they feel nice and they last a long time. In addition, we have a warm sound. The E string has a removable ball, so that the string can also be used as a loop-end. There are many choices in this price segment and trying them out is actually the best way to determine which strings best suit the individual violin.
Thomastik terminated the fabricating small sizes. Some smaller sizes are still availble.
Click here for the datasheet of Thomastik Spirit violin strings.