This is a 25mm trackball, often used with Keyball moNa and similar devices. If you'd like to purchase one, I will create a dedicated listing for you. Please specify the color you want in a comment. ■ Colors ・Light Gray ・Dark Gray ・Orange ■ Bundle Discount You can get a 300 yen discount if you purchase it with the "Keyball 25mm Trackball Case." If you'd like to take advantage of this, please make a combined purchase offer. ■ Responsiveness and Smoothness Based on my experience using it with the case mentioned above, the responsiveness and smoothness are excellent, and I don't think there's much difference compared to Perixx trackballs. ■ Material ・POM #keyball #Keyball39 #Keyball44 #moNa #25mm #ish #keyboard #trackball