Thank you for viewing! These are trackballs removed from a Kensington TB450! This is a set of two. They are very easy-to-use trackballs, but I removed them because I'm using a matte finish Perixx. They are in beautiful condition with no scratches. They have been stored at a private residence. Please refrain from purchasing if you are looking for perfection. Even if an item has likes, I may remove it from sale without notice. Thank you for your understanding. Immediate purchase is OK. I work during the day, so I may not be able to reply to questions or ship items until the evening or the next day after payment confirmation. No returns or refunds. Thank you very much.