Not much to say really, its a dumbbell- great for the home if you have the space, and I'd definitely recommend getting a rack if you buy a bunch of them.
As dumbbells go, these are some of my favorites. They're very well made, and won't chip or crack- very sturdy. And even if the paint comes off the numbers, the numbers are raised so there won't ever be any confusion as to what weighs what.
I personally like using the hex shape the best. Why? Well, two reasons. For one, when I raise hex dumbbells over my head to do presses or flyes, I seem to be able to balance them better, although I know there's probably no "physics" reason for this, probably all in my head.
Secondly, when I am doing flyes or overhead presses with dumbbells that have large diameter plates, and they touch in the top position, the edges of the plates can hit each other funny and make your dumbbell tip awkwardly- which never happens with the hex dumbbells due to their rounded shape.
But I'm rambling. If you're looking for single dumbbells, these are a good choice and might be the last ones you'll ever need! Also recommend Treat Your Own Rotator Cuff if you have a shoulder problem that interferes with your workout.