Ensso Pen UNO Raw Aluminum

From Los Angeles design studio Ensso, the Pen UNO is a study in functional simplicity. It’s made of raw aluminum with an anti-corrosion treatment, and features a sliding barrel that serves as both a wide grip section and a cap that protects the tip—and your pocket—while in transit. Twist the barrel to the left to move it down the length of the pen when you’re ready to write, and then back to the right to move it up over the tip. One of the slimmest pens on the market, it still offers nice writing feedback. Plus, it’s easy to maintain: When it’s time for a refill, use a flathead screwdriver (or even your nail) to remove the end cap and access the ink cartridge inside.