These are a pair of HD545 References in blue. The headband will need a new pad installed and the retention clip will need fastening on again. An HD600 headband pad will work. They are included with the stock cable and 1/4 inch adaptor. I replaced the earpads with aftermarket ones, but I will include the plastic mounting clips that will help with mounting different pads on. Sennheiser does not sell these mounting plates separately. I am open to offers but no low balling. US buyers only. Paypal only, and if we have reached an agreement I will send a Paypal business invoice. Payment is due before shipping.