Sennheiser 37974 - replacement headphone cable with 3,5mm (mini-) jack for old 400 series, HD 222, HD 224, HD 230, HD 250, HD 414, HD 420, HD 424, HD 425, HD 430, HD 440, HD 442, HD 450/ Reference, HD 450 II, HD 480, HD 490 II, HD 50, HD 520, HD 530, HD 540/ Reference, HD 560, (not HD25). Cable length: 300cm