FFMM (Finger Friendly Machine Marks) designed by collecting plenty of fingerprint parameters, makes easy to plug and fingerprint-free. 3.5 mm gold-plated plugs prevent the contact surface of plugs from oxidation. KEVLAR wire, with excellent flexibility, anti-perspiration and anti-static, helps reduce the cable intertwining. Diamond-cut unibody and aluminum alloy piston-like chamber, manufactured with ultra-precision numerical machining Diamond Cut. Gift box packaging and high-intensive FDA-grade silicone earphone holder, non-toxic and tasteless, help protect the earphone better and more easily to carry.