The DSi XL stylus is 96mm long, just 4mm longer than the stylus on the DSi, but the XL also includes a 129.3 mm-long pen-shaped stylus, which does not fit inside the console.
The DSi XL stylus is 96mm long. This is just 4mm longer than the stylus on the DSi. The XL also includes a 129.3 mm-long pen-shaped stylus. Stylus does not fit inside the console.