The TH-900 is the first high-end headphones form Fostex featuring the newly designed driver unit with1.5 tesla (15,000 gauss) magnetic circuit and bio-dynamic 50mm diaphragm, traditional Japanese lacquered "Urushi" finished craftsmanship housing and selected 7N OFC cable. All coming together to achieve the sonic goal of a wider stereo field, high resolution and transparent reproduction.Unique designed Neodymium magnetic circuit adopting the magnetic repulsion system with the 1.5 tesla (15,000 gauss) magnetic flux density to achieve wider dynamic rangeFoster / Fostex"s unique "Biodyna" diaphragm* for fine and high resolu-tion sound reproductionThe housings are made of Japanese Cherry Birch (Betula Grossa), the Japanese specialty with rigid and dense texture for maximum acoustic performanceThe housings are finished by the traditional "Urushi" lacquer (a.k.a. Japan) by a 100 years old artisan group. The finish used for the TH-900 is called "Bordeaux" and is simply stunningPlatinum foiled "Fostex" logo on the housingsThe ear pads are made of protein leather made from eggshell membrane for maximum confortThe cord is made of 7N grade (99.99999%) OFC (Oxygen Free Copper) and duralumin plug case for higher durabilityComes with an elegant headphone stand in the packageType: DynamicDriver: 50mm dia Nd magnetImpedance: 25 ohmSensitivity: 100dB / mWMaximum Input: 1,800 mWReproduction Frequency: 5 â€" 45k HzWeight: 400g (excluding the cord)Cord: 3m Y type 7N-OFCPlug: 6.3mm dia gold coating stereo phone plugAccessory: Headphone stand