Kz castor pro: IEM is an upgraded version of

KZ Castor Pro IEM is an upgraded version of KZ Castor which is designed with the needs of professional musicians in mind, the KZ Castor Pro combines advanced electronic crossover technology with a precision four-level tuning filter. KZ Castor Pro IEM with HD Mic, Dual 10mm Dynamic Driver, Harman Target Improved Bass for Hi-Res Audio Quality, 4 Tuning Switch, Oxygen Free Copper Flat Cable, 0.78mm 2Pin & 3.5mm Plug Compatible The KZ Castor Pro X features dual 10mm dynamic drivers in each shell, with one dedicated to ultra-low frequencies for deep & punchy bass; while the other handles mid and high frequencies for clear as well as detailed sound. KZ Castor Wired IEM Earphone with Mic, 10mm Dual Magnetic + 8mm Dynamic Driver, Harman Target with Improved Bass in Ear Monitor, 4 Tuning Switches, 2Pin Detachable Cable