DIY Full Metal Headset head beam Metal headband 100g weight 110mm LCD3 HE560 HE6 HE400SE - AliExpress
How to: Hifiman Tear-Down, Grill Mods, Pad Swaps, Headband Replacement - YouTube
HIFIMAN HE400se | Headphone Reviews and Discussion - Head-Fi.org
Another HE400se headband mod : r/headphones
The headband of the R7DX is tension-free, as it does not fit hermetically sealed headphones. So I changed HE400SE headphones and headbands, and I got a very satisfactory result. | Drop
THE Ultimate Step-By-Step Hifiman Headband Replacement Guide from OLDSTOCK Hifiman (HE-4/5LE/6/400/500) into the NEWSTOCK (HE-400i/560) !!! | Page 12 | Headphone Reviews and Discussion - Head-Fi.org
Amazon.com: Geekria Protein Leather Headband Pad Compatible with Bose Beats JBL ATH Hyperx Skullcandy, Headphones Replacement Band, Headset Head Cushion Cover Repair Part (Black) : Electronics