For sale or trade is a pair of 540G headphones in fully functional condition and good but not prestine cosmetic condition. 300 Ohm version. The 540G is one of the most highly regarded Sennheiser headphones, especially for their balanced frequency response character. The foam disks have been recently replaced with genuine Sennheiser parts. Price includes US domestic shipping. Please add 3% paypal fee or use paypal gift. If you happen to have Singxer SU-1 for trade, I am open to the option. Thanks.