Fender FXA2 Professional In-Ear Monitor Headphones, Blue Custom 9.25mm precision rare-earth drivers with Groove-tuned port 3D-printed DHT shell fits 95-percent of ears for a custom-like experience 6Hz-23kHz frequency response for lifelike sound reproduction 112dB at 1mW sensitivity for distortion-free audio Includes deluxe carrying case, SureSeal tips, cleaning tool and cable