Logicool ERGO M575S Logitech Trackball I've been using it for about six months. I don't need it anymore because I bought a new one. There's some white stuff on the right-click button. It looks like it could be removed by scraping it off, but I don't want to scratch it, so I won't do it. Otherwise, it's generally clean. I'd like to ship it via Takkyubin Compact, so I'll wrap it in bubble wrap before shipping. I'll fold the box and include it.