I bought this because I could not find the equivalent from ClosetMaid, who apparently does not make single cubes.
I am using it to raise a media rack off of the floor, so it needs to support 15 lbs; so far it is holding up.
It is held together by 3M tape; you can read about it on the manufacturer's site. It is very light in weight, and more of a cream color than a pure white.