Schmidt Green Medium with Metal Tube Rollerball Refill SCHMIDT Technology – specialist in writing technology introduces completely new writing instrument refill. Schmidt Metal Tube Rollerball Refill offers great performance and easy handling. Most of the pen manufactures in the globe rely on ink refills produced by SCHMIDT Technology. SCHMIDT Metal Rollerball Refills avoid drying by the mode of sophisticate ventilation system and are designed for use in writing instruments that are without perfect sealing cap. The tip of refill glides easily and smoothly over the paper.