The Light Grey Trackball Replacement Ball by Kensington is a specific replacement part for a trackball device, featuring an ergonomic design for comfortable use. This replacement ball is compatible with the Kensington K64215 trackball model and utilizes optical tracking technology for precise cursor movement. With a sleek light grey color, this trackball replacement ball includes two buttons for easy navigation and does not come with a charger included. Perfect for those looking to replace a worn-out or damaged trackball ball, this product by Kensington offers a reliable and efficient solution for enhancing the functionality of a trackball device.