VelPad
Verified as compatible with 4 headphone models.
Evidence
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hifiman.com
HiFiMAN identifies VelPad as the HE400S stock earpad and explicitly states it is compatible with HE-series headphones, naming HE4.
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hifiman.com
HiFiMAN identifies these as the HE400S stock earpads, explicitly lists compatibility with HE400S, and provides the proposed dimensions and installation description. It also describes the beveled velour design as directing the drivers toward the ears.
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eu.hifiman.com
HiFiMAN’s official store describes VelPad as compatible with HE400SE, identifies its beveled design, and gives the stated dimensions: approximately 54 mm inner diameter, 106 mm outer diameter, and 25 mm thickest/16 mm thinnest.
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hifiman.com
HiFiMAN identifies VelPad as its HE400S stock earpad and explicitly says it is compatible with HE5, separately from HE5LE.