Pro Head 2 Golf Swing Training AidBEST STEADY HEAD AND SPINE ANGLE SWING TRAINER ON THE MARKET Backed up by over 20 years of research and development, the PRO HEAD is proven to be the MOST ADVANCED and COMPLETE golf trainer available. Unique and patented design, engineered by golf industry professionals and endorsed by PGA Teachers of the Year Martin Hall, Lou Guzzi and other top coaches and pros. You get professional quality and long term durability with a complete 2 year warranty.