Sennheiser PXC 450 Over-Ear Active Noise Canceling Headphones (PXC450)
Amazon.com: Replacement for SENNHEISER PXC 310 BA 370 PX MM 550 MM-550-X 450 Travel 550 Travel MM 400 MM 400-X MM 450 MM 450-X MM 500-X PCX 360 BT PX 210 BT Battery : Health & Household