Sony MDR-E818LP Fontopia Ear-Bud Headphones with Acoustic Twin Turbo Circuit (Discontinued by Manufacturer) Super-light, ear-bud headphones are perfect for exercise Features Sony's acoustic twin turbo circuit for improved efficiency 16 mm driver units for deep bass sound and clear treble PET diaphragm for minimum distortion and superb high-frequency response Neodymium magnets provide maximum energy with minimal size 50 Mw; 16Mm Dia Driver, Cable Lenght - 1.0m Fontopia In-The-Ear Design; Neodymium Magnet