There are a lot of top professionals using the Seemore putters – the have a unique balancing system.
The milled back cavity insert also interacts with the milled stainless steel body to enhance feedback and create a solid, crisp, silky feel that is unprecedented and must be experienced to understand. 
The m3 – Specs
• The m3 is a classic mallet with center shaft and RifleScope Technology.
• 100% milled 303 stainless steel head accounting for 95% of mass.
• 100% milled 6061 lightweight aircraft aluminum back cavity insert.
• Standard head weight 345 grams, loft 3.5 degrees, lie angle 70 degrees.
• Standard grip is a Golf Pride classic 3 size options.
• The m3 is available in left hand.
• Custom lie options available.
The Putter has a creates high moment of inertia (MOI) and has an expanded sweet spot. Merges with 303 stainless steel head to enhance feedback and feel.
100% Milled and Made in USA.