LZYDD 55mm Huge Trackball Replacement for Kensington Wired SlimBlade Trackball Mouse/Kensington Expert Wireless Trackball Mouse (K72359WW) /K64325 /k72327 (Black)

So far so good, seems to work fine with the Nulea M512 55mm trackball mouse, bought this as a backup, the black colored trackball makes it look more like a Kensington, but pretty satisfied with it so far, shipping packing could've been slightly better but no huge deal. Why did you pick this product vs others?: The Nulea Trackball appeal was mostly about price and somewhat aesthetic, but I wanted a replacement 55M in case the stock red one got damaged, but also the black color gives it a different type of feel and look although feedback seems pretty much the same. Size: Fits perfectly as a 55M trackball, I think 17.28 cm is listed as the circumference, 5.5cm as the diameter if that helps.

I ordered the "black" one (looks just like the picture except not the size of a baseball!), it fits the Slimblade perfectly. The ball does have a slightly more slippery feel to the touch, but in use it is a very subtle difference versus the original. Definitely a great deal if your original ball gets damaged and you need a replacement, but if you're looking for some kind of upgrade or enhancement this isn't going to do anything for you, imo.

Perfect for my wired Kensington Expert mouse and so much better than my old ball with all the dings in it.

Fits right into my expert trackball. The red color is very nice and better than the gray one I had before. ❤️

I was so excited to replace the red one with this after reading the positive reviews. It fit perfectly but the ball doesn’t register properly, causing the cursor to skip and act weird on the screen.

I didn't think I needed this. I bought is as a backup ball for my Kensington Slimblade ball in case it got damaged, but when I tried it I was blown away. It's way more slippery, which means the mouse curser moves much faster. It's almost like the ball is floating. It's also way more precise for micro-movements. This is a must buy if you are unhappy with the somewhat jerky default trackball. Just buy it.

This worked in my Kensington track ball. Perfect replacement. Thank you!

Item: LZYDD 55mm Huge Trackball Replacement for Kensington Wired SlimBlade Trackball Mouse/Kensington Expert Mouse. Pro: The only 55mm replacement trackball I could find for my Kensington Expert Mouse mdl k64325. Con: slightly too big resulting in noticeably slower movement. Electrostatically picks up dust. Yes, the ball is very smooth but that does not help.