REVIEW / MEASUREMENTS: (Mass)Drop + HiFiMan HE-4XX Planar Magnetic Headphones (with Brainwavz XL Round Hybrid earpads). Maintenance if the earcup detaches. - Archimago's Musings
Enhanced Metal Headband For Hifiman HE6s HE6se HE560 V2 He4xx Deva Pro Headphone | eBay
BGWORLD Replacement headband parts for Hifiman HE400 400I 400S HE560 560I HE500 300 350 HE3 5 6 headphones - AliExpress
Enhanced Metal Headband For Hifiman HE6s HE6se HE560 V2 He4xx Deva Pro Headphone | eBay
THE Ultimate Step-By-Step Hifiman Headband Replacement Guide from OLDSTOCK Hifiman (HE-4/5LE/6/400/500) into the NEWSTOCK (HE-400i/560) !!! | Headphone Reviews and Discussion - Head-Fi.org
Hifiman HE4XX w/ ZMF Pad Upgrades (impressions in comments) : r/headphones
THE Ultimate Step-By-Step Hifiman Headband Replacement Guide from OLDSTOCK Hifiman (HE-4/5LE/6/400/500) into the NEWSTOCK (HE-400i/560) !!! | Headphone Reviews and Discussion - Head-Fi.org
HE5XX Review, From An Entry to Midfi User Perspective : r/headphones
Enhanced Metal Headband For Hifiman HE6s HE6se HE560 V2 He4xx Deva Pro Headphone | eBay
Drop + HIFIMAN HE4XX Planar Magnetic Over-ear Open-back Headphones,midnight-blue: Amazon.co.uk: Electronics & Photo
THE Ultimate Step-By-Step Hifiman Headband Replacement Guide from OLDSTOCK Hifiman (HE-4/5LE/6/400/500) into the NEWSTOCK (HE-400i/560) !!! | Headphone Reviews and Discussion - Head-Fi.org
A tail of two intro level Hifiman headphones : r/headphones
Can a headband replacement improve the sound of the 4xx? : r/headphones
Headband replacement for the HE4XX and other things... : r/headphones