This is a fast stable driver that can handle full power throws and moderate headwinds. Advanced players and sidearm throwers will appreciate the dependable stability. The Boss has a slight high speed turn to help maximize distance with a predictable fade. David Wiggins Jr used a 154 gram R-Pro Boss to set the World Record 338 M (1108.92 feet) for the longest throw in March 2016. The Champion Boss flight numbers have been updated to better reflect the more stable flight. (13/5/0/3) Diameter: 21.2 cm Rim Width: 2.5 cm Available Plastics: Star: 165-175g GStar: 165-175g StarLite: 130-169g EchoStar: 170-175g Champion: 172-175g Blizzard: 130-159g Pro: 165-175g R-Pro: 135-164g DX: 151-175g Best Choice for: Power players, Sidearm throws, Fast, long distance off the tee Date of Approval: 08/26/08