The Impromptu is a heavy-duty tactical pen that features a stainless steel body and a carbide glass breaker embedded in the pen’s tip for emerency situations. Push-button mechanism reveals a "Rite in the Rain" ballpoint pen cartridge, so it'll make it through the harshest of elements.
I've carried one of these pens every day for around two years. It's petty hefty for a pen but I love it anyway. It writes really well thanks to the space pen cartridge. When I bought mine, my wife at the time was not happy about the price. About six months later I used it to sign my divorce papers. Worth every penny.
Just received my Impromptu from Blade HQ, very happy with the quality.