These are beautiful glasses. First let's address the leakproof seal. It does keep things from leaking out BUT please keep in mind that anything inside WILL leak out if you tip it because of the straw hole. I'd also like to address the very negative review I saw that said they were not even. not the case AND the listing states"【After-sales Service】: If there is any problem that our can glass cannot meet your needs, please contact us in time. We will quickly provide help to solve any problems that may arise." Had that person reached out to the seller they would have taken care of the problem. Let's be understanding that ANYTHING manufactured can have something go wrong that gets missed in quality control. Let's face it, it's not the sellers responsibility to reach out to you the customer, YOU must reach out to them!These are stunning when you make cold drinks like coffee with cream swirled in it or when you make fresh drinks and decorate with fruit. They make great gifts and take vinyl perfectly! Waterslide works too. Dress them up or leave them as is either way they are just perfect! Oh one mention is there is no straw stopper so it will come out easily.
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