Ping karsten tr true roll golf putters five of pings most popular timeless and tour proven head designs are showcased in the ping golf karsten tr true roll putters the karsten tr offers variable depth grooves precision milled into the face of the 17 4 stainless steel head to improve ball speed consistency for unmatched distance control this b60 model is designed for golfers with a slight arc in their putting stroke the elastomer back cavity insert significantly improves feel and sound