[Set of 4] 10 oz Double Wall Ultra Clear Insulated Coffee Mugs Espresso Mocha Green Black Tea Cups USA Company, Real Borosilicate Glass ~ We Pay Your Sales Tax

Love them, except one imploded (I believe there is a vacuum in the void) for no reason. Yes it had hot fluid in it but they are made to do that. I made a mocha gave it to my Finance and while she was caring it the cup went POP! It wasn't mistreated (hand washed) not banged around at all, no thermal shock (hot to cold too fast). She is to scared to use them now. Surprisingly little mess the vessel part held so no fluid and big glass shards not thousands of little pieces.If you dare, they are great otherwise, it takes less time to froth and you can hold the outside no matter how hot the fluids are inside.