Hi Flamencito,
The following is a response from Liz Benoit Crew, D'Addario Orchestral Strings Product Specialist:
"I would compare the response and feel of Zyex light tension to be close to the Evah Pirazzi weich set, with a slightly more textured, gut-like sound. When played pizzicato, Zyex as whole has a comfortable, flexible feel with less “roll” or torsional movement than traditional gut strings. It bows nicely, as well. The Zyex light tension set has a bit of quicker response (in both pizzicato and arco) and slightly more flexible feel than our Zyex medium tension set."