PENON Vortex Single Dynamic Driver 2Pin 0.78mm + EPRO Horn Silicone Eartips Audiophile In-Ear Earphone IEMs The PENON VORTEX, is a product of the PENON brand in collaboration with EPRO Audio,the EPRO EP00. EPRO Audio is known for their patented horn silicone eartips . Description Resin...