Mustard Ballpoint Rollerball Writing Pen - Glow In The Dark X-Ray Pen Plastic Black Ink Ballpoint Pen Measures 2 x 4.3 x 1.2 inches Fun Halloween themed ballpoint pen with black ink. Use this pen by day or night thanks to it's Glow-in-the-Dark skeleton body Not suitable for children under 36 months due to small parts, choking hazard.