ER9-10K

The ER9-10K arrived within the ER9 line in 2018 as, per Midwest Golfing Magazine, the ultimate high-MOI mallet in the family, built around the same stability-first philosophy that defines the broader ER9 shape but pushed further toward mass and resistance to twisting.

The maker's own page lists a build heavy on stability hardware: a 6061 aluminum head, a 303 stainless steel hosel, and 303 stainless cylinder weights, run on an FST Stepless shaft with a .370 inch tip and Evnroll's own non-taper 1.2 grip. It's offered with either a plumber neck or short slant neck, and swing weight is balanced by length, listed at E4 for 33 inches, F0 for 34 inches, and F4 for 35 inches. The maker's page also describes the putter's aim as delivering consistent distance to the same spot on center and off-center strikes alike, a claim about mis-hit forgiveness that lines up with the high-MOI category Midwest Golfing Magazine assigned it.

That same publication lists it at 33, 34, and 35 inch lengths with an MSRP of $359 USD, and reviewer Rife, writing there, called the putter stability on steroids, a line the magazine used to frame the ER9-10K as the top-end MOI option in the ER9 range. Community and editorial opinion here point in the same direction, praising high MOI and stability, with no dissent recorded against that read.