LAMY Vista Fountain Pen - Medium - L12MThe LAMY Vista line consists of high quality pens made of clear, non fade plastic and self sprung metal clips. A variety of ink cartridges or a LAMY converter can be used with this pen. Installing ink cartridges is easysimply insert the cartridge into the pen nib section (no need to push the cartridge all the way in), then twist the pen barrel onto the nib section. Attaching the barrel automatically punctures and installs the ink cartridge.