Ferenc Ferdinand Weisz is back with another guest post. This time for an Isospeed String Review of Black Fire and Baseline Speed. Isospeed is special to me because the Isosport factory is only 20km away from my home. I’m a half-hobby stringer who does stringing for local players. I mostly work with Isospeed, because every player here knows this brand and they are using it with satisfaction. That is why …
