Used a few times after opening. I tried it on trackballs from Elecom and Logitech, but there was a slight catching feeling during operation, and the operability did not improve in my environment, so I am selling it. There are no noticeable scratches or stains. The cause is not clear, and it may be a compatibility issue. Perixx PERIPRO-303 GBK 34 mm Replacement Trackball Glossy Black Speed Type Compatible with PERIMICE-517/717/520/720 Replacement Ball Logitech/M575/M570 ⚠ Everything in the picture is included. ⚠ Please refrain from purchasing if you are sensitive to used items. ⚠ Returns and claims are not accepted after purchase.