Here's an excerpt of a review and video of Hank Haney's Swing Band as seen on sandbox8.com.:

"Lots of things can easily go wrong in your golf swing if you’re gripping the club too tightly or loosely. The greatest players in the history of the game, Jack Nicklaus and Tiger Woods, in their “How To” books emphasize the importance of steady and consistent grip pressure.  While making my way back from the equipment area at the 2010 PGA Merchandise Show, I came across Hank Haney’s Swing Band and wondered what this color coded band was all about."  Read the full article Hands-On: Hank Haney’s Swing Band.

View the below video of Hank Haney's Swing Band developer Colby Huffman demonstrating his product at the 2010 PGA Merchandise Show.