Classification of specialized accessories and optional components used for performance enhancement, mounting, protection, and maintenance of pneumatic cylinders. Includes rod boots for cylinder rod protection, magnetic sensors for position detection, mounting brackets and flanges, cushion adjustment valves, air cushions, rod ends, fitting adapters, seal kits, etc. Distinguished from pneumatic cylinder main bodies, these auxiliary components are designed for system function expansion and maintainability improvement. Essential components for customization according to cylinder applications and achieving extended service life in pneumatic system construction for automation lines, assembly equipment, conveying machinery, etc.