Powerballs - help for carpal tunnel

Wow, these Powerball things are great. I've been using them for years to help my wrists with Motorsports and golf... but now I've got all the computer guys in the office using them to help with carpal tunnel and sore wrists. The nice thing about them is they are low impact and you can use them while your on the phone or sitting at your desk without any problems. We've been having speed competitions in the cubicles for a change of pace.