The Bridgestone RXS used golf ball is the first "tour performance" series that is designed for Amateur swing speeds. It is a 3-piece used golf ball built for extra spin control and added feel. The B330 RXS used golf balls is designed for players with swing speeds of less than 105 mph, who demand a little softer feel than the B330-RX. If you are of average swings speeds but would like to get more performance out of your used golf balls, the Bridgestone B330-RX and RXS series is what you are looking for.