Amazon.com: JULONGCR HD 450BT Earpads Replacement HD 4.50 BTNC Ear Pads HD 4.40 BT Ear Cushions Cover Parts Compatible with Sennheiser HD 4.40 BT/HD 4.50 BTNC/HD 450BT Headphones. : Electronics
Sennheiser HD 4.40BT Bluetooth Over Ear Wireless Headphones - Black | eBay
Sennheiser is launching the HD 4.50BTNC & HD 4.40BT wireless headphones - The Audiophile Man