● Logitech ERGO M575 genuine 34mm trackball only. The color appears to be light blue. I am selling this because I replaced it with a third-party ball immediately after purchasing the M575. ● Although unused since I replaced it immediately after purchase, I have touched it once, so those who are concerned may want to refrain from purchasing. ● I will ship via Rakuraku Mercari's Nekopos service. The size is borderline, so I will put it directly into a cushioned envelope, so please understand. ● I cannot offer a discount due to shipping costs, but thank you for your understanding.