1.COMPATIBLE WITH SENNHEISER HD4.50BT & MORE: These earpads have been designed to be suitable for Sennheiser HD4.50 Headphones, plus, HD 350BT, HD 4.40BT, HD 4.50BT, HD 4.50BTNC & HD 450BT models. They will not fit any other brands or models. Please double check the model of your headset. These are compatible earpads, manufactured by .2.REPLACEMENT EARPADS: Perfect replacement for worn out and old stock cushions, made with soft foam and PU / Vegan leather fabric.3.COMFORTABLE ON-EAR PLACEMENT: Relax in comfort with replacement ear cushions. They fit comfortably on your ear without distorting sound so you can savour the notes with clarity and comfort.4.DURABLE FOR HEAVY USE AND A LONG LIFE: Exceptional craftsmanship and materials went into each set of headphone ear covers. You'll enjoy them for years, no matter what you put them through.