The RITR All-Weather Bullet Pen is a leap forward in writing technology which writes at all angles (including upside down) in any weather including rain, snow and any environment from hot desert to freezing mountains! Unlike other writing instruments, pens and pencils, the Bullet can write easily over grease, dirt and muck as well as onto glossy surfaces such as photographs and all weatherproof papers. The Bullet's permanent ink reservoir is contained under pressure and can write over a mile before running out. Dimensions - L9.5cm. Weighs - 20 grams. Colour - black.