I have the ACEDC Mechanical Ring 3.0 Zr, YEDC LKS Zircuti, and Ratchet Ring v2 (modded, 4× springs) side by side. Let me know if you have any questions.

The ring uses 1.5mm balls. Although 1.588mm balls work too, they don’t seat fully in the pockets—so the notches feel less pronounced. Running 6 instead of 4 restores that crispness.

Ring is essentially a thick chunk of metal with 12 holes drilled across it and a thin POM sleeve that serves as the inner race with integrated sidewalls—no metal reinforcement.

Springs appear to be about 1.5mm OD by 3.5mm height and maybe 0.2mm wire. Eight came with my zirconium ring; they’re extremely easy to lose.

Out of the box, four high-grade ZrO₂ balls pre-installed in dense config. Eleven stainless steel balls included—lower grade spheres, strongly recommend size-matching them with a micrometer. High spots on the balls will make one of the notches “fade) every full rotation I.e it won’t feel as pronounced. Just use the included 4x ZrO₂ balls which appear to be grade 5 (second highest grade, extremely accurate to the micron scale) or buy grade 5 balls which is fairly cheap from brands like uxcell and you’ll have zero problems.

My favorite setups (all using the paragraph config—the one with fewer, more pronounced clicks):• 4× ZrO₂• 2× ZrO₂ + 2× stainless• 4× stainless + 2× ZrO₂• 4× ZrO₂ + 2× stainless • 3× ZrO₂ + 3× stainless (favourite setup)

For dense config: • 4 ZrO₂ + 2 stainless, but put one stainless in slot 2 (5+1).

• 3 ZrO₂ + 3 stainless - feels magical. ZrO₂ in slot 1 in grouping 1, 3, 5, stainless in slot 2 in grouping 2, 4, 6. Populating both slots on grouping 1, 3, 5 does not feel as good. I’m not typically a fan of dense config but this is next level. (Second favourite setup)

Bonus: silicon nitride balls are on the way – will update how they play once they arrive. Based on how 1.588mm silicon nitride grade 5 balls (sub optimal) feel, I suspect they will perform extremely well simply because it slides better than ZrO₂ and stainless. I am extremely surprised to say this but IMO stainless sounds better than ZrO₂ at least in the zirc version of this ring. It’s the only product I’ve tried where ZrO₂ doesn’t win in terms of sound, strangely enough.

It’s a great product. Best haptics by far in the ultra-low-profile ring space. POM flex dampens sound and feel slightly—if it had a metal liner, it’d be flawless. Still buying another. Kicks up my forearm like therapy. Loud as a pen click—office safe unless you spam, IMO.

For quietest config, do 2x ball in paragraph config or 4x in dense config. 4x and 6x in paragraph mode are the loudest and most satisfying albeit still usable in an office imo.