SCHMIDT Safety Ceramic Roller-Non Dry Refill Black 3pcs SetThis refill is suitable for international standard steel ball pen German SCHMIDT was founded in 1938 Professional writing instrument ranks first in the world, writing quality is stable Is the authority of international standard water based steel ball pen refills Made in Germany Specifications Refill color: black Refill nozzle diameter: 2. 5mm Pen diameter: 0. 4mm (SCHMIDT 285 EF) 0. 6mm (SCHMIDT 888 F) Pen bead material: Ceramic Writing length: 1000m