Brainwavz · Aftermarket replacement
Replacement Earpads for Sennheiser GSP300 series, soft PU leather and memory foam
Verified as compatible with 1 headphone model.
Verified compatible headphones
Evidence
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brainwavzaudio.com
Brainwavz explicitly lists GSP300 compatibility, product code BWAVZ-EP-SENGSP300-PU-BLK, PU leather and memory foam, installation into the ear-cup groove, and dimensions of 80 × 108 × 20 mm.