Compatibility: Sennheiser HD 4.50BT | HD 4.50 | HD 4.50BTNC | HD 4.50SE | HD 4.40BT | HD 4.30G | HD 4.20S | HD 458BT | HD 450 | HD 450BT | HD 400S | HD 350BT (Not compatible with HD 300 Pro). Breathable Foam Core: Promotes airflow to keep ears cool during extended use.
eBay