they are spill proof thermal drink cups.
I was going to guess they were canopic jars, but thermal cups sounds more likely.
Not gonna lie... it looks kind of like a pocket vibrator.
Pretty sure it's a water vessel of some sort. Or, a mini-vibe. Either way... Don't click.
I second Arabella, they are thermal coffee cups. That color of pink reminds me of the ones they were selling for Breast Cancer awareness. But I'm a bad consumer, so I say don't click the link. The cake is a lie... er... free samples...