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markers. ~ Rotring has virtually revolutionized technical pens with Rotring Rapidograph. ~ These technical pens are practically maintenance free and give more consistent reliable performance than other technical pens. ~ The secret is a unique disposable cartridge. ~ The cartridge acts as a storage area for ink and as the vent channel for the ink to be fed to the nib. ~ Once the cartridge is finished you replace it with an entirely new venting system. ~ This makes the Rotring Rapidograph the easiest, most reliable, refillable technical pen available today. ~ Stainless Steel nibs. ~ ink technical pens rotring rotring rapidograph pen; markers; art supplies pens;