First off the base and led lights are good quality.
The bad news is the circular caps are made wrong and will cause the trackball to drag. Take the cap off and the mouse will glide freely up down, left right.
The cases are also not white, they are beige.
Two ways you can fix this yourself.
Take a 3 oz WD 40 aerosol can and wrap 1500-2000 gif wet sandpaper. Put it half way on the cylinder and slip the plastic cap onto it. Sand it until you can get the cap on the cylinder 100% then keep sanding. The and retest the result on the trackball, clean the lid first with warm water and dry it with a microfiber cloth so you don’t attract dust into the trackball.
To fix the beige, get Forever Black dye in Amazon. 4!8: is made for cars, use the Forever black cleaner in the cap. Then brush on the black dye. Use rubber gloves unless you like your hands looking like dr. Frankenstein’s experiment.
It comes with bo mounting screws but it can be mounted with two really long screws and these may be hard to find an expensive. Instead use indoor outdoor black rubber mounting tape found at Lowe’s. This stock may no look like it will stick but it is stronger than gorilla glue and can take a ton of force. If needing to unmourned use a dryer or heat gun.