Ultimate Ears UE-6 Pro, 3-Way High-End In-Ear Headphones with 3 Drivers, 2 x Dynamic bass driver and 1 BA (balanced armature) driver for midrange and treble, Perfect fit with custom ear impressions (impression by hearing care professional required), High attenuation of 26dB, High quality interchangeable IPX cable with small diameter and weight, Hard inner ear piece, On request also in a variety of colours, Frequency response: 5 - 22,000 Hz, Sensitivity 102.5 dB @ 1 kHz, 1 mW, Impedance 12.5 ohm @ 1 kHz, Includes metal case with engraved name, Top class design and sound, Especially suitable for drummers, bassists and percussionists