uxcell 2.5mm Ceramic Bearing Balls, ZRO2 Zirconium Oxide Ball G10 Precision 10pcs

The fix to improve smoothness in the Elecom Huge trackball by replacing the stock ruby ball bearings with these zirconium oxide had been described on the internet. These worked great with noticeably improvement in usability of the trackball after putting them in. They have been working fine for the past 5 years with no perceived degradation in the motion characteristics with occasional cleaning of skin oil gunk.

I replaced the cheap 'ruby' bearings in a couple trackballs and the difference is incredible. It's far, far, farrrr smoother. You really don't feel any 'friction' just the weight of the ball. Some misc thoughts: -Replacing them: It's easy. Remove 5-6 screws from the bottom of your trackball. A couple more screws internally to free the bearings. Toss the current bearings, drop these in. Screw it back together. Takes about 10 minutes. Heads up though, Elecom uses a mix of Phillips head and T6 torx screws. Buy a cheap 'precision screwdriver' set if you don't have one already. -Fit: These bearings match MOST popular trackballs. I used this pack to do an Elecom Huge, Elecom EX-G Pro, and a Kensington. (I forget the name of the Kensington, but it's the classic one they've been making forever. Four big buttons, giant ball, you know the one.) The Elecoms benefited hugely. The Kensington, the difference was noticeable, but not dramatic. I'm not sure if they use better bearings or if it's just been worn in by years of use.

Huge upgrade for elecom trackball mouse. Replaced the junk balls in the mouse with these and what an amazing improvement

Got these to replace the ruby bearings in an Elecom Relacon (25mm ball). The ZrO2 is noticeably more slick than the ruby, but the static friction feels about the same. As a result, the mouse is even more jittery when trying to make small movements. Allegedly the G5 grade is better than G10 in this regard. But the problem should be minimal with larger balls.

Reduced the friction from the ruby bearings id say about half with these.

I bought these for my Elecom Huge and it make a HUGE difference (see what I did there). I was skeptical at first but the factoy "ruby" bearings definitely had flat spots. These are much, much better. When the time comes to replace my trackball, I'll be getting another one I can swap these into because it won't feel right otherwise.

Bought these to replace the bearings in my Elecom Huge trackball mouse. I thought it was pretty smooth to begin with but I bought the bearings and the mouse at the same time so might as well do the mod. Man do they make a world of difference. Gonna see if they fit in my Logitech Marble trackball and use them in it too. I have no way of judging how dimensionally accurate these are, but they worked great for my use-case.

These bearings are absolutely essential for the longevity of the aforementioned trackball, and should be bought along with it. If other people you know want to get said trackball, then you can spare them a purchase of the bearings because you will have enough to replace them in two more trackballs. Just be advised that these are easy to lose, so take care when getting them out of their bag and installing them. For that, you are advised to use a microfiber cloth to keep them from rolling around your work surface, and you MUST use scotch tape to hold these replacement bearings in place when reassembling the mentioned trackball. When everything is secured, you should see the bearings remain in position after taking off the tape. You will save yourself plenty of frustration and time.

Buen upgrade suavizan el movimiento en trackball con bolas pequeñas 34mm

I used these as a replacement for the stock "ruby" bearings in the Elecom Huge trackball mouse. It was suggested online that it makes a huge difference - so far I'm impressed. Can't speak to their other uses, but these worked perfectly for what I needed them for.

They're G10 precision, but you can get even better than that