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Class B Protein: Sony WH-1000XM2 / MDR-1000X 3rd party earpads
Material: Protein Leather
Outer Diameter: 98mm*80mm
Inner Diameter: 60mm*25mm
Protein leather is a kind of synthetic leather (PU) with protein powder. It makes it softer, more comfortable and the touch is closer to genuine leather. Bass is lively and punchy. Imaging is solid and has a good dimension. Isolation is good as well.
Class S / A / B:
Class S is the best quality earpads we have. It’s thicker, softer, more comfortable and long lasting than most of the stock earpads.
Class A has the same advantage of Class S but not as good, but the quality is still better than or similar to most of the stock earpads.
Class B’s quality is quite close to the stock one, but with a much cheaper price.