TWSBI began life almost 50 years ago as a manufacturer of other products; everything from Lego parts to high end writing instruments. Then in 2009 they started producing pens under their own brand name, and thus TWSBI was born. TWSBI pens are designed to make owning a piston-fill fountain pen affordable and fun. For those of you who like to take things apart to see how they work, these are the pens for you. Tutorials on how to disassemble and reassemble these pens abound online, if you're brave enough!