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ACME Studio offers an exceptional product - the World's Thinnest four-function Pen. It includes two Black Ballpoint Pens, a 0.7 Lead Pencil, and a PDA Stylus. The pen's body is brightly colored in yellow with black measurement markings. This unique design, known as "Ruler", was created by Adrian Olabuenaga. The pen is thoughtfully packaged in a custom 4FP tin accompanied by a black sleeve.