Sennheiser · Official replacement (OEM)
Earpads, black, 1 pair, for PXC 450
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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assets.sennheiser.com
The PXC 450 manual lists part 517680 as one pair of ear cushions with cover and says to pull off the old cushions and press the replacements on until they lock into place.
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ch.sennheiser-hearing.com
Sennheiser’s product page names PXC 450 compatibility, identifies the pads as genuine OEM, and lists article number 517680.