Vsonic New VSD5S High Efficiency Composite Diaphragm CCAW Moving Coil Drive Unit Earphones(2016 new packaging) Diamond cut design (rugged polycarbonate and glass mixed housing, crystal clear) Forming a casting sound chamber (good sound quality) Personalized auricular design (comfortable warmth) Beryllium diaphragm (electro-acoustic drive unit) Tensile wire is not wound (bulletproof silk wire)