This is a petit stand meant to hold a cupcake. I haven't measured it, but I believe the stated dimensions of 4" by 2" are probably correct. (The larger dimensions listed below the description are probably the packaged dimensions.) It comes in an adorable box and would make a cute gift for someone who likes cupcakes, assuming your friends aren't the sort of people to come on Amazon to complain about lovely things they were given for free. But you wouldn't have those sorts of friends, would you? Me neither.
You might substitute a macaron, muffin or even a kreuller – but this will not hold a full-size cake. That's why it's called a petit cupcake stand, with an illustration portraying one cupcake. It's small because part of a cupcake's allure it its smallness. If your cupcake won't fit on this stand, you might want to question whether it's really a cupcake. Personally, I don't buy into any of this 'jumbo cupcake' foolishness, but maybe that's just me.
The yellow is a nice soft buttercream. As of this writing, it's about $6 cheaper than the most popular shade, but probably just as cute.