5 pair 5cm foam ear pads Pads for KOSS Porta Pro Sporta Pro (Electronics)
Now I have several times had the same headset, the PC 131 from Sennheiser. According to the support the earpads of the following models are all identical: PC 20, PC 25, PC 30, PC 31, PC 35, PC 36, PC 130, PC 131, PC 135, PC 136, PC 140, PC 141, PC 14