Sennheiser · Official replacement (OEM)
Ear cushion (1 pair), article no. 523310
Verified as compatible with 2 headphone models.
Verified compatible headphones
Evidence
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global.sennheiser-hearing.com
Sennheiser’s product page independently names HD 380 PRO as compatible with ear cushion pair 523310.
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sennheiser.com
Sennheiser identifies the headphone as HD 380 PRO, article no. 502717, and lists replaceable earpads, part no. 523310.
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global.sennheiser-hearing.com
Sennheiser’s product page identifies article 523310 as earpads for the PXC 350 and the listed related models.
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sennheiser.com
Sennheiser identifies article 523310 as a pair of ear cushions suitable for the PXC 350, along with HMEC 250, HME 95, and HD 380 PRO. The page notes that it is no longer available to purchase.