These Sennheisers have very good levels of background noise reduction, are lightweight and are comfortable due to soft, circumaural ear pads and single-sided coiled cable. Space-saving design with collapsible, rotating ear-pieces and 2-year warranty. The exceptional 32 dB reduction of external noise makes the HD 28 particularly suitable for use in a high-noise environment. The headphones have replaceable parts for long life, neodymium magnets for optimum sensitivity and wide dynamic range The HD 28 is a closed-back, circumaural headphone designed for professional monitoring applications, although suitable for a very wide range of applications