The Ping iWi putter series is a 2009 addition to Ping's highly praised line of putters. The iWi putter series is a high end offering from ping, geared towards low to mid handicap golfers. It is the first customizable line of putters offered by Ping, allowing golfers to change the overall heel-toe weight ratio by inserting tungsten weights in the sole of the putter until a desired feel is achieved. There are 9 weight combinations available to the user by way of an optional (sold separately) weight kit. The Ping iWi series also features a two-piece face insert system, a 304 stainless steel face insert is encased in an elastomer backing, in order to provide steel-face performace with a softer feel.