The o works tank 7 putter is a modified mallet with weighted alignment wings a double bend shaft high contrast versa alignment microhinge face insert adjustable weighting tank counterbalance full shaft offset and a superstroke gripunmatched roll with our new microhinge face insertthis new technology will change the way people look at roll off the putter face forever our microhinge insert technology provides incredible gains in topspin and roll at impact regardless of your stroke the s