Brainwavz · Aftermarket replacement
Brainwavz replacement earpads for Sennheiser HD 4.50 series (including memory-foam and material/style variants shown on the product page)
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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brainwavzaudio.com
Brainwavz’s separate product page explicitly lists HD 4.50 BTNC compatibility for its real-sheepskin-leather and memory-foam variant.
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cs.brainwavzaudio.com
Brainwavz’s own product page explicitly names HD4.50BTNC among compatible models and presents these as its replacement earpads.