The ER9 was Evnroll's stability flagship in the 2018 relaunch: a large mallet built by milling a 6061 aluminum body with hollow cylinders running from face to rear along the extreme heel and toe, then loading those channels with steel weights to push MOI far past a typical tour mallet. Golf Digest covered it as Evnroll going 'stability on steroids,' and the concept was pushed even further later with the ER9-10K variant, which doubled the roughly 5,000 MOI of many tour putters to near 10,000. It kept the SweetFace milled-groove face shared across the Evnroll range, dialed back slightly on the ER9-10K since the extreme head stability reduced how much face correction was needed.
Recognized by mainstream golf media (Golf Digest, GolfWRX, GolfPunkHQ) as a genuine engineering standout for MOI, and MyGolfSpy gave it first-look feature coverage, but there is no evidence of tour-star attachment or forum-driven cult chasing the way the MP-32 or Ping Eye 2 are chased -- its reputation is functional (stability numbers), not mythological.
Best for golfers who mis-hit putts inconsistently and want maximum head stability and distance-control forgiveness, including higher handicaps or anyone fighting toe/heel strikes; not for players who want a compact look, a lighter swingweight, or feedback-driven feel -- the head is large and the counterweighted Gravity Grip setup changes the swing feel noticeably.
Launched in Evnroll's 2018 refresh at the same $359 MSRP tier as the ER8, it competed with high-MOI mallets like the Odyssey O-Works #7 and TaylorMade Spider Tour; the ER9-10K pushed further than any rival at the time. A modern equivalent in stability terms is Evnroll's own ER10/Zero Tour Spec line or an Odyssey Ai-ONE Double Wide.
Among the most forgiving putter heads on the market: extreme heel/toe weighting via internal steel rods drives MOI toward 10,000 g-cm^2 in the ER9-10K variant, roughly double a standard tour mallet, so off-center strikes lose far less ball speed and start-line accuracy than in a smaller mallet or blade.
Calibrated across the whole catalog — a tour blade scores low here on purpose; it means control, not ease.
Realistic 2026 private-party pricing for a standard ER9 runs roughly $180-$300 depending on condition and shaft, with the rarer ER9-10K Extreme commanding a premium (SidelineSwap/eBay listings for clean ER9-10K examples trend toward the higher end of that range or above given its smaller production run).
Reading is one thing — hitting is another. Book a bay and see the numbers for yourself before you buy anywhere.
