These are Target exclusive Halloween Glass Skull Margarita Mixers. They come in three flavors: Mango, Lime, and Strawberry. The mixes contain no alcohol and require refrigeration after opening. I can't tell you how these mixes taste (I didn't buy the strawberry flavor) because I'm not going to be opening them until Halloween. But they will still look cool sitting on the counter as a Halloween decoration until then.
I can tell you that I have uses for them after I open and use the contents. I'm thinking the simple idea is to use them next Halloween, fill them with colored water, maybe add a couple of rubber worms or fake fingers. But then the idea of cleaning them out and filling them with Tequila or Vodka or Rum would also work. My own, less expensive, skull liqueur bottles. That would probably stay up year round on the bar. Because skulls aren't limited to Halloween.
Each skull contains 23.7 fl ounces of mix. The first three ingredients are water, sugar, and malic acid. A 5.5 ounce serving contains 150 calories. Each skull will run you around $8. Though they show up on the Target.com website here, they are not sold online.