These SE535 Sound Isolating Earphones provide professional grade sound using Triple High Definition MicroDrivers, with a dedicated tweeter and dual woofers. They will help you discover new depths to your audio. Triple High Definition MicroDrivers, including dedicated tweeter and dual woofers, for audio clarity across the frequency range Integrated passive crossover ensures that high and low frequencies remain distinct and defined Spacious sound with rich, responsive bass Fit Kit includes flexible foam, silicone and triple flange sleeves in multiple sizes, for optimal comfort, bass response, and sound isolation (up to 37 dB) Detachable and formable reinforced cable Gold plated MMCX connector has a lock snap mechanism, allowing 360-degree rotation for a comfortable fit