This is the Purpleheart Fostex TH-X00 headphones, part of a very limited edition run by Massdrop. Equipped with the biodynamic cone Fostex first developed in the late '80s, which delivers a sound unique to any other driver structure, the TH-X00 benefits from years of iterating on that design. The higher magnetic flux density in these headphones (more than 1 tesla) creates instant attack and decay for a crisper, more detailed sound signature. With the emphasis on the low end toned down slightly from the TH600, the rich bass meets the Fostex standard without becoming bloated. The top end's been taken down several decibels, too, neutralizing any sharp, sibilant highs and putting the emphasis on the mids. The density of purpleheart wood makes it excellent for reducing acoustic resonance. Includes carrying pouch.Massdrop