Ping anser milled putters

I can help here, having owned one previously.

0, 1 & 2 are all (approx) 45 degree toe hang models, generally regarded as “slight arc” fitting putters.

3, 4 & 6 have more toe hang due to the type of hosel on each model. Pretty sure 6 has the most toe hang.

5 is a face balanced plumbers neck model. Slightly longer hosel to create the face balancing.

Hope that helps. They were/are nice putters.
 
And if you have the app, and the device to fit to your current putter shaft, it will tell you which of the numbers suits your putting stroke and match one of their putters to your stroke.
 
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