The advertised product stated "EarPads Compatible Headphones:- Turtle Beach Stealth 400 450 500X 520 600 700 900- Ultrasone PRO-900, HiFi 780"I bought these earpads to replace those on my Ultrasone PRO-900. If I tried these on in the store I probably would not have kept them. Lasted for two boys worth of wear - def worth the extra money Just got these and am very disappointed. So, I ordered these because the reviews were good. Ive not listened to any other headphone (including open back electrostats) that more faithfully reproduces the nuances of an upright bass played as part of a jazz trio. I have bought two sets of these pajamas now. This Product is great and I would Love to recommend this to others who is looking for High Quality Earbuds. I get no notification of updates, either. So far so good after week 1.