Audiosharp AS1209 Zinc Alloy Metal Stereo In Ear Headphones with Deep Heavy Bass Oxygen free copper wire dynamic drive unit Full covered by Zinc alloy shell for corrosion resistance. 56 Strands of Oxygen-free copper wire for lossless transmission. 8 mm Top dynamic drive unit, Premium sound quality. Deliver a comfortable, clear, high-quality listening experience. Ergonomic Design. Comfortable to wear and easy to carry. Stunning surround sound, Tuned carefully by top engineers, sound more real, the bass is elastic. Super Noise reduction tecnology, away from the noise.