ER9 – 10K Extreme

The ER9 10K Extreme, per coloradoavidgolfer.com's reporting, is exactly what its name promises: a moment of inertia listed at 10,000 g/cm², built out with dual adjustable heel-toe weights and offered in 33", 34", and 35" lengths at an MSRP of $360 USD. The maker's own page lists the construction underneath that number: a 6061 Aluminum head CNC milled in Carlsbad, California, with a 303 Stainless Steel hosel and cylinder weights, an FST Stepless .370" tip shaft, and swing weight balanced by length, 33" at E4, 34" at F0, 35" at F4, offered with a Plumber Neck or Short Slant Neck.

That MOI figure is also the release's whole story. coloradoavidgolfer.com called it out directly, noting the number exceeds the USGA's limit of 5,900 g/cm² by some distance, and added that it's not entirely clear at this point what Rife's thinking might be. That's a mixed read from a single outlet, not a resolved question, and the maker's page makes no mention of conformance either way. The maker's language leans on the line that new Evnroll putters deliver unprecedented accuracy, virtually the same distance to virtually the same spot from center and off-center hits, which is the same pitch made across the ER9 line generally, just pushed here to a figure well past where the rest of the line sits.