SPT510 35pl Printhead for Seiko Model: SPT-510 Number of nozzles: 510 Native resolution: 180 dpi Max. Resolution: 720dpi Printhead width: 71.8 dpi Drop size: 34mmpl Firing frequency: 6.46 or 8.29 KHz Type of ink: Solvent The SII Print ink SPT series is designed for integration into a variety of printing applications. It features a fast firing frequency and high precision combined with a lone useable life.