SANWA 55mm Trackball, 2.17in Replacement Ball for Kensington SlimBlade, SlimBlade Pro, Expert Mouse, Perixx Keyboard Periboard-522/322, and Other Compatible Mouse, Glossy Red

Just received the small red replacement ball for my Jelly Comb wireless trackball model MT50. Fits perfectly, smooth as silk and feels like a quality replacement. First impression is that this was a good purchase, satisfied.

Fast shipping, works awesome!

Sometime during the night my cat knocked my Elecom EX-G off the couch and the ball popped out. He must have thought he'd found the best cat toy ever because he rolled the ball off to who knows where.This ball is a perfect replacement. Fits great, very smooth.

I put this is my Elecom EX-G which the older version seems to ship with bad trackball. This ball fixed my tracking issues but it's small so it skips around inside the mouse. Sometimes it gets stuck. I don't recommend this for that mouse. I had to go with a Perixx pro replacement trackball instead which ended up being a perfect fit.

My Logitech ball was despite all the cleaning I did, hard to make the curser move. So I thought I would give these a try. They seem to be very slightly smaller in diameter. Their function though is really good. Love these so much I am buying another one for my other computer.

Does not work in my Nulea wireless trackball mouse.. it doesn't "catch", the ball spins the pointer goes nowhere. Didn't realize it until it was past the window. (Why can't it be 90 days like Walmart?) Btw, Nulea is the best wireless mouse I've ever used.

This replaced the ball in my Logitech MX Ergo mouse. It matches the original ball in all aspects except for color, which I went with to give a little extra "pop" from the stock gray. I noticed an improvement in tracking, but this could be attributed to the original ball being worn from the 5 years that I've owned and used this mouse.

PROS:* Nice finish ball looks great* Fits in Logitech Trackman Wheel Trackball mouse okay* Definitely High PrecisionCONS:* The standard Windows mouse driver that works with my Logitech Trackman Wheel Trackball mouse will not get this ball to a point where it is truly usable. One full rotation of the ball on the fastest mouse travel setting moves the pointer about an eighth of an inch. That is too little motion.* Ball is a fraction smaller than my original ball but still fits.* Three stars for comfort as to many turns of the ball to get any motion.* Three stars for price as there should be a driver for a high precision ball as this can't be a new issue.I would not buy this mouse again without having fixed the driver problem in that there needs to be more travel with this mouse. I will be looking for a driver that will fix the problem with this ball as there probably is one out there. If you have Logitech Trackman Wheel Trackball mouse I would not recommend unless you have a better driver for the ball.