High Density Environmentally Friendly PC MaterialThis innear monitor headphones adopt High density environmentally friendly PC material,which is comfortable and smooth to wear. providing a more comfortable, stable, lighter experience. Clear Sound H89 plug in headphones for computer adopts 11MM PET Polymer Diaphragm. The large dynamic coil brings a fuller and richer bass, wide and thick sound field, and clear vocals. We will once again refresh the instrument details and deeply restore the on-site atmosphe, great vocal resolution, wide sound field, richer instrument details, and delicate music performance. The Comforts & Noise Isolating You Were Looking for We didn't just focus on sound quality, also the ultra-lightweight material and ergonomic shapes providing maximum comfort and lightness. Wearing without Pressure, Releasing the Burden of Ears. There're also 3 sets of soft eartips for different ear sizes.richer bass, wide and thick sound field, and clear vocals. Hig