Ping Heppler Putter. Heppler Ketsch Putter Features: Aluminum face, steel back Machines flat face for firmer feel and sound Adjustable length shaft Head weight: 370 grams High MOI Loft: 3° Slight arc/straight stroke Stock grips: PP59 small pistol, PP60 lightweight midsize pistol, PP61 larger pistol, PP62 oversize pistol (largest) Men's mallet putter Ping