Dynamic stereo headphones, studio monitor type, MDR-CD900ST. - Brand: SONY - Model Name: MDR-CD900ST - Type: Studio Monitor Headphones - Connection Type: Wired - Features: Dynamic Stereo Headphones Thank you for viewing. Several years have passed since the purchase, but it has hardly been used. However, the pads show signs of aging, so we recommend replacing them. Operation has been confirmed. As expected, the sound quality is superb, living up to its reputation as a professional-grade masterpiece. We will carefully pack and ship it. * The original box, etc., is not included.