Velour Earpads
Verified as compatible with 3 headphone models.
Evidence
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jp.hifiman.com
HiFiMAN’s official store explicitly lists compatibility with “300” in its HE-series list and gives the stated dimensions: inner diameter about 57 mm, outer diameter about 105 mm, thickness 24 mm.
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down.hifiman.com
Official HE400se manual confirms the exact target model and says its pads should remain installed during use. The manual result verified here does not expose the proposed flange/snap-on method or thinner-front/thicker-back orientation, so those installation details are not independently confirmed in this check.
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eu.hifiman.com
HiFiMAN’s official listing explicitly names HE400SE as compatible and gives the stated dimensions: approximately 57 mm inner diameter, 105 mm outer diameter, and 24 mm thickness.
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jp.hifiman.com
HiFiMAN’s official store explicitly names 5LE among compatible models and lists the proposed dimensions.