https://teamknox.com/en/tech/gadgets/inputdevices/20_cst/index.html Package In use Overall Structure The Scent of “Made in the USA” Combining with Foreign Keys For use with the left hand Kensinton While the company’s trackball often comes up in conversation,CST rarely does. The reason I love this trackball is that it’s Made in USA, and since the ball itself is 57 mm in diameter, you can swap it out for a billiard ball. For a while, you could do this with the Kensinton model as well, but it’s no longer possible—likely because it switched to an optical sensor, which requires a special surface treatment. Hugo en-us