Features: Sturdy Support Design : plastic for enhanced durability and stability, for offices professional who need long hour of mouse use, ensuring steadiness during intense work . Toolless Replacement Structure : Easily install and replace without tool, allowing users to complete process in seconds. Ideal for those who frequently swap accessories, minimizing downtime and boosting productivity. Aesthetic Upgrade Experience : enhances your mouse’s overall look with this sleek base, designed for users who value a tidy and stylish workspaces, improving both organization and mood. Extended lifes : Replace worn out parts to ensures prolonged mouse performances and reliability, perfect for professional who demand consistent device functionality without interruptions. Exclusive M575 Compatibility : Specifically for M575, offering perfect fit for optimal comfort and performances, providing tailored solution for M575 mouse owners. Specifications: Materials: Plastic for M575 mouse Color: Black Package Includes: 1PC Trackball Mouse Base note: Please allow 0-1cm error due to manual measurement. make sure you not mind before bid. Due to the differences between different monitors, the Pictures may not reflect the actual of the item.