Yup...the other guys have it right Nick! It seems with "pro versions" the companies will either make the ball weaker than it's normal version (like the Bolt Pro) or stronger as is the case here.
Honestly, within storm's line up the Razor Wire / Barbed Wire are nice **DRIER** lanes balls. The one that you would pick is totally dependant on your style though as the BW is basically just a slightly stronger Big Hit...but the Razor Wire is a step up from that.
If you are still throwing 16lb's you could always get an older Too Hot if you are looking into something with the hook potential of a Razor Wire.
--------------------
-Chris : DJ's Pro Shop : Auburn, MA