Sony MDR-E9LP/BLK Earbud Headphones, Black (Discontinued by Manufacturer) Super-Light, In-The-Ear Design Open air, dynamic High quality 13.5mm driver units Super-light in-the-ear design Neodymium magnet to reproduce powerful bass sound Connectivity technology : Wired Super-light in-the-ear design High quality 13.5mm driver units Neodymium magnet to reproduce powerful bass sound Open air, dynamic