Denon AH-C252 Binaural Earphone - Wired Connectivity - Stereo - Earbud - White Compact and lightweight design Hybrid design has aluminum housings and soft elastomer outer layers for excellent durability, comfort, and audio quality Acoustic Optimizer technology balances pressure on both sides of the diaphragm to provide a neutral tone and deep bass response Soft silicone eartips are provided in 3 sizes to find the best fit for comfort and noise isolation Oxygen-free copper cable has excellent conductivity and provides plenty of slack