I'm not sure about the quality of the metal these mugs are made of. The silicone seems fine. No leaking issues but my son kept coming back to me to install the lid. They may stretch a bit over time. I bought these for my 7 and 8 year olds because they were starting to enjoy hot tea and I don't want broken cups. Also, it would be a great camping kit. They definitely do NOT hold 12 ounces! I use the hot water feature on my Keurig to brew tea in cups and the 10 ounces almost fill the cups leaving just enough room to add cream and honey so for the reasons I bought them they are still usable, but then again not what I thought I would get. When I've ordered 16 ounce mugs I wonder what it would actually be, I've considered getting them instead and maybe I should have. Because of this, I'll probably try a different brand next time. Also, I would be careful where you put your mugs when you first fill them with hot liquids as these mugs are very thin and VERY hot so they can melt the countertop.
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