So you can see it's approximate size. But it has to be to support the whole hand the way it does. You can see it get's used. My wrists don't hurt like they used to before the Evolution found it's new home. The ball is really good once it breaks in.
Most people hate cleaning their mouse or trackball.
I'm reminded of just how much I use the programmable buttons. Really it's a fine trackball and the support is very nice on the hand. I really recommend it. Also, don't toss your mouse pad. Place the Evolution Track ball on the pad, as it helps dampen the vibrations and makes it more pleasant to use.