HPD and HRD Headphone Drivers Peerless headphone drivers are designed for both over-ear and on-ear platforms. Along with their high sensitivity and low THD, these drivers offer extended high frequency response, optimal clarity, and smooth bass performance. Featuring excellent sound quality and performance, these drivers are a premium alternate to the typical cheap, off-the-shelf headphone drivers. Key Features: Size Range: 40mm – 50mm Diaphragm: Polymer, Paper Motor: Neodymium Contact Us About Tymphany