Edition XV, The Evolution of a Masterpiece ^^ Dual Enhancements. Enhanced Magnet Design and Neo Supernano Diaphragm Gen. 2 ^^ Using Rare-Earth-Free permanent magnetic materials with an optimally designed structure, materials to achieve asensitivity that's comparable to drivers with Rare-Earth magnets ^^ Neo Supernano Diaphragm Gen. 2. Only 60% of the first-gen diaphragm thickness ^^ New Composite Headband. Weight reduction of 20-30g with rotatable hinges for enhanced wearing comfort