I've had these dice on my person, almost since I received them. Yesterday I pulled them out of my pocket because I was playing with Handful of Heroes Figures with my daughter and wanted to give some structure to the play. I noticed that the Gear Die had developed a problem, the #2 Gear's edge has popped up.
Now to be fair, I have been very hard on these Dice. They have been in my pocket since April. They've been in my pocked at scout camp, they've been in my pocket in 100+ degree weather, they've been in my pocket when I've been fishing, they've been in my pocket at church. They bounce around with other things in my pocket, and deal with extreme temperature changes, I think they've done very well. The Halo Die is still in perfect condition.