Perixx 34mm replacement trackball. It's a glossy, speed-type trackball in yellow, but the image is of a mustard-colored pearl finish. I bought it new, but I'm selling it at a low price because I purchased a different color. I've attached images of it installed on a Logitech MX Ergo s. This is a ball-only sale. The mouse is not included. Although it's new and unused, the box was originally damaged, and I opened it to set it in the mouse, so please understand. Thank you.