Reviving my old Logitech TrackMan Marble FX - Lenz Grimmer's blog
Logitech TrackMan Marble Mouse Trackball – Most Ergo
Still using this old Logitech Trackman Marble FX. I never found a more comfortable new trackball to replace it with. : r/Trackballs
Buy Logitech Trackman Marble Trackball Mouse – Wired USB Ergonomic Mouse for Computers, with 4 Programmable Buttons, Dark Gray Online in Hong Kong. B001F42MKG