Amazon.com: XANAD Case for Sennheiser Headphones,Fit for Sennheiser HD 450BT / HD 350BT / PXC 550 II / HD280PRO / Sony MDR7506 & MDRV6 Wireless Headset : Electronics
EarTlogis Velvet Replacement Parts for Sennheiser PXC450 PXC350 PC350 HD380 PRO HME95 G4ME Zero EarPads Bumper Headband Earmuff - AliExpress
Amazon.com: SENNHEISER HD 450BT Bluetooth 5.0 Wireless Headphone with Active Noise Cancellation - 30-Hour Battery Life, USB-C Fast Charging, Virtual Assistant Button, Foldable - Black : Electronics