Sennheiser IE 300 Audiophile High-Fidelity Earbuds.

The IE 300 uses a 7mm Extra Wide Band (XWB) dynamic driver, developed in Germany, which is designed to provide a natural and balanced sound with low distortion. The earphones have a lightweight and ergonomic design inspired by professional in-ear monitors. They come with a variety of ear tips, to help users find a comfortable and secure fit that also provides good passive noise isolation. The detachable cable is reinforced with para-aramid for durability. The earphones connect with gold-plated Fidelity+ MMCX connectors. Open box never used.