My NC 700s are chipping from lightly tapping against a wall. Bose gives me an option to send them back and get a replacement under their warranty but the warranty says that
Bose Noise Cancelling Headphones 700 — Over Ear, Wireless Bluetooth Headphones with Built-In Microphone for Clear Calls & Alexa Voice Control, Silver: Amazon.co.uk: Electronics & Photo
Bose Warranty IS AWESOME. My QC35 malfunctioned and so did my Sleepbuds. They've exchanged it for the new 700 Series and I've exchanged the SleepBuds for the SoundSport Free. Freaking awesome! : r/bose
Refurbished Bose 700 noise-cancelling headphones are just $240 ($60 off) via Bose's eBay store
Decolor of Stainless Steel Headband and out of warranty : r/bose