Write upside-down with gas-pressured technique. Unlimited shelf life with special ink. Stainless steel tip. Fit Parker Writing stroke M SCHMIDT MegaLine pressurized technology turns everything upside down! These highly sophisticated writing modules are based on an inside over pressure. This enables not only a writing upside down or under the most extreme environmental conditions, but also a writing with highest speeds.The SCHMIDT MegaLine system allows to write and to draw in each possible situation without any problems this is really cutting edge refill technology. Writing instruments equipped with SCHMIDT MegaLine pressurized refills are a reliable partner for their owner always and everywhere. Thanks to their air tight system, these refills have a literally unlimited shelf-life.They are equipped with stainless steel tips manufactured with utmost precision as well as special ink pastes developed exclusively for this purpose.