What to say, it is a rosin, a good one so no magic in it, as it is a rosin:) good to have for your bow, but wont play instead of you. You can have better for less money, or you can pay a lot more it depends on you. As for rosins goes, this one is from Brussels so probably work the best in Brussels and places with same climate, as humidity and temperature are related with performance. Play well and in tune please any rosin will do the job fine if its made yor your climate.