The Grey Pneumatic sockets I have only have small gold size markings, nothing is engraved into the steel. The few sunex sockets I have have small gold lettering and the size stamped into the steel. I honestly think (probably incorrectly) that Grey Pneumatic and Sunex impact sockets come from the same Taiwanese factory but, leave in different packaging. Their size offerings are pretty close and individual differences are small. Either brand will serve you well. I have seen great deals on Ebay for both brands. The cost of a replacement socket is fairly cheap so, even if you were to break one, It probably wouldn't be worth mailing in if you didn't have a local dealer.