A size comparison between the Logitech Cordless Trackman Optical, the Microsoft Trackball Optical, and the Elecom Huge, for if anyone is curious. : r/Trackballs
Logitech Trackman Marble Mouse, USB 1.0, Left/Right Hand Use, Gray/Red (910000806) | OfficeCrave.com
Logitech Ergonomic Wireless Trackball Mouse, Easy Thumb Control, Smooth Tracking, Black - Walmart.com