Fashion&Cool Full Metal Jacket HiFi In-ear Headphones earphones headsets with Strong Bass for Music Enthusiasts Headphone cavity material is copper(front) and anodised aluminium alloy(back), making the vioce more clear Diaphragm material is PEK, ususlly used in high-end headphones, better than PET diaphragm ofen used in ordinary headphones.The red circle on the front cavity indicates the RIGHT side and blue one shows the LEFT side. Damping material absorbs noise, making the voice more pure, Wire core material is LC-OFC oxygen-free copper liked by music enthusiasts, better than enamelled copper wire core used in ordinary headphones. Earphones with 3.5mm jack can be used in all mobile PhonesIpad/MP3 players/PC 18 months Warranty on parts