Lamy's flagship fountain pen is the 2000 made of stainless steel. It is piston filled and as such can only be used with an ink bottle and not with ink cartridges. The piston has a large capacity and it has a medium nib.
Lamy 2000 Fountain Pens - The Goulet Pen Company
LAMY 2000 Fountain Pen, Black, Extra-Fine Nib 2000 Black Extra Fine Point Fountain Pen Filo Lamy Refer the use and care tips on the image section
Lamy 2000 4 Color Ballpoint with Brushed Stainless Steel Clip