RAPTGO x HBB HOOK-X
14.2MM PLANAR + PZT DRIVER OPEN BACK IN-EAR EARPHONE
Adopts Double-sided Array N52 Magnet Design and Ultra-thin Diaphragm
Custom Made 14.2mm Planar Magnetic Driver
12 Layer Double-Sided PZT Driver with Upgraded Thick Double-sided Conductive Silver
Improved Open-Back Cavity Design for Less Hearing Fatigue and a better sound performance

In excellent condition. Come with case and cable with 3.5mm connector only. $259 new, asking $159 OBO.