Geekria · Aftermarket replacement
Geekria QuickFit replacement earpads (memory foam, protein leather)
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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shop.geekria.com
Geekria’s product page explicitly lists Superlux HD 440 among the compatible headphone models and describes the replacement pads as memory foam with a protein-leather covering.