The Bolt is a machined, bolt-action pen body. It weighs 2.8 ounces and is 5.625" in length (overall). This pen body uses any Parker ballpoint compatible refill (including the Fisher Space Pen refill) and features a stainless clip and hardware. We designed The Bolt to be fun to use and to be extremely durable. This may be the last pen you ever have to buy. Each pen is machined from solid brass, in our shop, right here in the good ol' USA.