First custom earphone in the world with a single 14mm dynamic driver couples with advanced frequency suppression technology (FST). Frequency Response: 10-20000 Hz Impedance：16ohms（including cable） Sensitivity (at 1kHz)：116dB spl (1mW) Important: Due to the size of the driver, people with small ears may not be able to fit. We would need your ear impressions to check for sizes...
50mm-55mm Headphone Earphone Earbud Ear Pad earpad Foam Cover * Brand New & high quality * Balanced density, flexibility * Elastic, comfortable and durable * enhance sound quality,Noise isolation * Fit most earbud-style earphones with 50-55 in diameter. Diameter:25mm 30mm 35mm 40mm 45mm 50mm 60mm Material: foam