2 Xezo Speedmaster roller ball pen refills. Blue. German-made. Fine point. Writing point is 0.5-0.6 mm. Approximate writing length per each refill is 1,000 meters/3,280ft/ 0.62 mi. Length: 112.7mm (11.27cm) / 4.43 in. Diameter: 6.2 mm (0.62cm) / 0.24 in. Shelf life is approximately 2-3 years. Shelf life can vary depending on the temperature and moisture of storing. Avoid extreme heat or extreme cold.