Ping sigma g doon counter balance putter the new frontier of feel and forgiveness the sigma g putter family sets new performance standards in feel stability and touch covering the entire hitting surface is an innovative insert combining highly responsive pebaxreg elastomer and a milled aluminum face to provide full face forgiveness a softer feel and consistent ball speeds will help you hole more putts than ever a high energy pebax elastomer insert behind the anodized 6061 aluminum face pro