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1Pair Earpads Ear Pad Cover Cushion for Sennheiser HD4.50BT HD4.50BTNC HD4.40BT | eBay
Replacement HD4.50BT, HD4.50BTNC, HD4.40BT Memory Ear Pads Cushion Compatible with Sennheiser HD 4.50BT, HD 4.50BTNC, HD 4.40BT Bluetooth Headphones - Newegg.com
Sennheiser HD 4.50 BTNC Wireless review: A worthy Bose competitor at a better price - CNET