It's gallium! :D I was a little worried, having received this without any note as to what it was, but after some research, and a message from my SS, it was discovered it was gallium. This is actually pretty cool, since I remember seeing a video where they had a gallium spoon, and it melts in water. Really cool gift! I just put some in my hand, it's pretty interesting feeling, kind of like a mix between water and gel.