Those scales look like some material I have made some pens out of. It was cast in Alumalite to make the blanks. One of these pens ended up with a friend that we all joke is so rough on his gear he could warp an anvil, I spoke to Jim after he'd had the pen for a little over a year, and he was still loving it, and he actually ordered a couple of new ones from me :thumbup: I guess it depends on how they were actually made, but those look like they would be durable to me.
Good Luck!