The Stilwell fits perfectly in your coin pocket, but it’s easily deployed with one hand using the removable lanyard. The lanyard tucks away inside the cap when in use, and is designed to be rattle-free. To ensure that the Stilwell writes well in whatever conditions you get yourself into, it uses a black D1 roller-ball ink cartridge. The D1 cartridge is ubiquitous; easily found all over the world. With its titanium or aluminum construction, it’s designed to stand up to hard daily use. The Stilwell uses a triple O-ring construction to securely lock the cap in place, in both the open and closed positions.