As shown in the third photo, the rubber supports for the trackball are all missing. Unlike a normal product, the trackball spins too freely, so I'm offering it at a bargain price. Thank you. It is a used item and has some dirt. It will be shipped in simple packaging. Ergonomic design black mouse, Logitech ERGO M575. - Brand: Logitech - Model Name: ERGO M575 - Color: Black - Features: Ergonomic design - Switch: ON/OFF switch Thank you for looking.