Features: The for G102 G304 G305 Mouse Fixed Roller Positioning Torsion Spring is engineered with high strength to ensures stable roller positioning, enhancing the operational efficiency of your equipment. from steel, this torsion spring boasts wear resistance and corrosion protections, offering long service and easy installation. for mechanical engineers, equipment maintenance personnel, and industrial production line operators who demand reliability and durability in their tools. Perfectly for use in automated production lines, conveyor systems, and various industrial equipment requiring precise roller positioning. This metal accessory is essential component in maintaining the operations of machinery, making it in any industrial setting. Specifications: Materials: Metal for G102 G304 G305 Mouse Package Includes: 6Pcs Mouse Wheel Preloaded Spring note: Please allow 0-1cm error due to manual measurement. make sure you do not mind before you bid. Due to the differences between different monitors, the picture may not reflect the actual color the item. Thank you!