The last few balls I drilled from the 900 Global plant didn't have thin shells! I know when I first started drilling them, they appeared to be a little thinner! I really don't care about the thickness of the shell, just the performance! I've had thicker shelled back crack more and very few thin shelled balls crack! All the balls coming from the 900 Global plant have been some of the best rolling and performing that I've seen! Just my $.02, Bruce