Schmidt MegaLine 4889 Black Ink Pressurized Ball Point Refill. The Schmidt Megaline system allows not only writing upside down or under the most extreme environmental condition, but also a writing with the highest speeds. The air tight system gives these refills a literally unlimited shelf-life. They are equipped with a stainless steel tip manufactured with the upmost precision as well as special ink pastes developed exclusively for Schmidt MegalLine pressurized refills.