Dynamic stereo headphones, the MDR-CD900ST, offer high-quality sound and are ideal for professional music production. I purchased these about three years ago, but I've never had the opportunity to use them, so I'm putting them up for sale. - Brand: SONY - Model: MDR-CD900ST - Type: Dynamic stereo headphones - Ear pads: Leather - Headband: Padded Although they are unused and in good condition, they have been stored for three years. Please understand this before purchasing.