Couldn't be happier with these blanks. But the real winner here is the amazing help I've received from Carolyn on the support team. She has beyond helpful and thoughtful over the past year as I made an engagement ring with next to no idea what I was doing. And most recently, giving me a nice chart to help my fiancée and I decide between ceramic and carbon fiber. As for the carbon fiber blanks them selves, the durability is amazing and exactly what we needed. I've worn mine to work as a machinist for the past couple weeks and it's seen chemicals, drops, scrapes and more and it still looks like the day it arrived.