Rite in the Rain, Item Nº 20K, Mini Bolt-Action Pen, black with black ink. Small but mighty, this pen is built to last. Writes through mud, sweat, rain and even spilt coffee. Uses full-size cartridges for refill. The triangular barrel and textured grip make for trustworthy handling. Strong lanyard clip keeps your pen close at hand. Bolt-action feature means your pen won0t accidentally open in your pocket. Proprietary ink and delivery system used exclusively in Rite in the Rain Pens will write without skipping, even in extremely wet conditions. 4.37"L x .7"D x .43"H.