Geekria · Aftermarket replacement
Geekria QuickFit Replacement Ear Pads for Sennheiser PXC450 and listed models
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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shop.geekria.com
Geekria’s product page explicitly lists Sennheiser PXC 450 as compatible and says the original pair of plastic rings should be taken out from the old earpads when replacing them. It describes memory-foam and protein-leather construction.