Useful Links

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

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