Let me say something here ...
It may be the sweat. I use to take vitamin C on a regular basis, anywhere from 500mg to a gram a day. I buy or have replaced through warranty a pair of walkman headphones on average every six months because the wires become brittle over time and eventually crack the surrounding plastic and breaking the copper wire(s) inside. Think of almost spaghetti wire stiffness, though the wires do remain bendable.
The wires will always become more and more brittle over time from where the wire extends out from the two speaker cases to perhaps a foot down to where the wire will not have constant contact with the skin of my neck. The plastic will always be really stiff near where the plastic is in contact with the skin of my face and neck, yet the foot or two or three close to the connecting jack the wire
always remains supple and bendable. I blame this wire problem on the ph of my sweat when I ingest a bit of vitamin C on a regular basis. The times when I reduced my intake of C to 3x a week, eating fruits and vegetables and the wires still become brittle, though over a longer span of time.
Koss headphones have a lifetime warranty and will replace any headphones if you send them back through the mails, for ten dollars, no questions asked. Their PortaPro model has excellent sound reproduction ..., but I digress.
My PowerBook G4 Titanium has paint flaking on both right and left sides where my wrists rest as I type. My sweat is of a chemistry, vitamin C or not that just doesn't leave things alone. I don't really care about paint flaking though. Function is all that matters, basically.
The right side I tried to make look more rectangular. Little bits just continue to flake off though over time.
