Geekria · Aftermarket replacement
Comfort Foam Replacement Ear Pads for Koss Porta Pro / KPH40 / KSC35 / KSC11 / KSC17 / KSC75
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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shop.geekria.com
Geekria’s product page explicitly lists KSC11 as compatible and says the package includes two replacement cushions.