The SE Electronics Dual Pro Pop combines two types Pop filters in to one: nylon and steel! Each pop filter does what it says, filter the noise, especially the low 'rumble' and Pop frequencies. The steel filters very resolutely and effectively, the nylon version is slightly milder and has a slight roll-off in the higher frequencies. By a hinge between the two types of filter you can determine the desired result yourself with the Dual Pro Pop. This can be very different per instrument / vocalist and per microphone! Best of both worlds!