The POP Stopper's unique metal screen is not simply perforated but louvered at a slight angle to redirect ultra-low frequency breath blasts which are pushed past the side of the screen. This process does not attenuate high frequencies, as fabric screens do, and leaves the vocal performance unaffected but without annoying low frequency "pops." It's also built to last and will take a lot more abuse than a traditional fabric shield, so it works wonderfully for commercial applications.