Our G5 anti-microbial fiber hair is exclusive by us, because of the fiber looks like real squirrel hair, so we may also call it squirrel synthetic, but most people would like to call it G5.
G5 means generation 5th, it should be surpass G4, it did. This type of synthetic fiber material is made from BASF in Germany with strictly quality standard, and it is used in making brush knots after secondary processed in our another Japan fiber factory.
The key characteristic of this fiber is resistance to bacterial, we add antibiotic constituents to the fiber so it doesn't grow bacteria easily in wet conditions. We also can offer certificate of original from our supplier if anyone wants.