Geekria · Aftermarket replacement
Geekria Earpad + Headband replacement set for SteelSeries SIBERIA 800/840
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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shop.geekria.com
Geekria explicitly lists SteelSeries Siberia 800/840 compatibility, says the package includes two replacement earpads and one headband pad, and gives the cushion dimensions as 3.7 × 3.7 × 1.0 inches (9.3 × 9.3 × 2.5 cm).