http://www.taylormadegolf.com/testpenta -you have to say you're a 15 or lower index/handicap, play 3 or more rounds each month, and play one of these balls: Titleist ProV1, ProV1X; Bridgestone B330, B330 RX, B330 RXS, B330S; Callaway Tour is, Tour iz, Tour ix; Nike 20XI, 20XI-X; Nike One Black, One Tour, One TourD, One Platinum; and Srixon Z-Star, Z-Star XV