Useful Links

Powerblock Dumbbell Official Site
You can read many details and information about Powerblock Dumbbell in their manufacturer site. Details like complete features, technical specification and etc.
http://www.powerblock.com/

Powerblock Dumbbell on Wikipedia
In this wikipedia, you can browse the complete list of Powerblock Adjustable Dumbbells products including Powerblock Dumbbell.
http://en.wikipedia.org/wiki/Powerblock